java.lang.InstantiationException when using inheritance and abstract base class and embedded object

### Task List

- [x] Steps to reproduce provided
- [x] Stacktrace (if present) provided
- [x] Example that reproduces the problem uploaded to Github
- [x] Full description of the issue provided (see below)

When using Inheritance from an abstract base class as an embedded object, the `list` criteria query throws `java.lang.InstantiationException`.

### Steps to Reproduce

1. Create a Grails 4 application.
2. Remove hibernate dependencies and add the Grails MongoDB plugin.
3. Create an abstract base domain class `Address` as:
```
abstract class Address {
String street
}
```
4. Create another domain class `HomeAddress.groovy` which implements `Address` as:
```
class HomeAddress extends Address {

String type = "home"
}
```
5. Create a domain class `Patient.groovy` which as embedded address as:
```
class Patient {

Address address

static embedded = ['address']
}
```
6. Try to access list of all patient using following query:
```
Patient.list()
```

### Expected Behaviour

The query `Patient.list()` should return all the patients with embedded address information without any error.
### Actual Behaviour

The following exception is thrown:
```
Caused by: java.lang.reflect.UndeclaredThrowableException
at org.grails.datastore.mapping.core.DatastoreUtils.execute(DatastoreUtils.java:319)
at org.grails.datastore.gorm.AbstractDatastoreApi.execute(AbstractDatastoreApi.groovy:40)
at org.grails.datastore.gorm.GormStaticApi.list(GormStaticApi.groovy:607)
at org.grails.datastore.gorm.GormEntity$Trait$Helper.list(GormEntity.groovy:682)
... 1 more
Caused by: java.lang.InstantiationException
at org.grails.datastore.bson.codecs.BsonPersistentEntityCodec.decode(BsonPersistentEntityCodec.groovy:76)
at org.grails.datastore.bson.codecs.decoders.EmbeddedDecoder.decode(EmbeddedDecoder.groovy:27)
at org.grails.datastore.bson.codecs.BsonPersistentEntityCodec.decode(BsonPersistentEntityCodec.groovy:121)
at com.mongodb.operation.CommandResultArrayCodec.decode(CommandResultArrayCodec.java:52)
at com.mongodb.operation.CommandResultDocumentCodec.readValue(CommandResultDocumentCodec.java:60)
at org.bson.codecs.BsonDocumentCodec.decode(BsonDocumentCodec.java:84)
at org.bson.codecs.BsonDocumentCodec.decode(BsonDocumentCodec.java:41)
at org.bson.codecs.configuration.LazyCodec.decode(LazyCodec.java:47)
at org.bson.codecs.BsonDocumentCodec.readValue(BsonDocumentCodec.java:101)
at com.mongodb.operation.CommandResultDocumentCodec.readValue(CommandResultDocumentCodec.java:63)
at org.bson.codecs.BsonDocumentCodec.decode(BsonDocumentCodec.java:84)
at org.bson.codecs.BsonDocumentCodec.decode(BsonDocumentCodec.java:41)
at com.mongodb.internal.connection.ReplyMessage.(ReplyMessage.java:48)
at com.mongodb.internal.connection.InternalStreamConnection.getCommandResult(InternalStreamConnection.java:393)
at com.mongodb.internal.connection.InternalStreamConnection.receiveCommandMessageResponse(InternalStreamConnection.java:299)
at com.mongodb.internal.connection.InternalStreamConnection.sendAndReceive(InternalStreamConnection.java:255)
at com.mongodb.internal.connection.UsageTrackingInternalConnection.sendAndReceive(UsageTrackingInternalConnection.java:99)
at com.mongodb.internal.connection.DefaultConnectionPool$PooledConnection.sendAndReceive(DefaultConnectionPool.java:444)
at com.mongodb.internal.connection.CommandProtocolImpl.execute(CommandProtocolImpl.java:72)
at com.mongodb.internal.connection.DefaultServer$DefaultServerProtocolExecutor.execute(DefaultServer.java:200)
at com.mongodb.internal.connection.DefaultServerConnection.executeProtocol(DefaultServerConnection.java:269)
at com.mongodb.internal.connection.DefaultServerConnection.command(DefaultServerConnection.java:131)
at com.mongodb.internal.connection.DefaultServerConnection.command(DefaultServerConnection.java:123)
at com.mongodb.operation.CommandOperationHelper.executeWrappedCommandProtocol(CommandOperationHelper.java:242)
at com.mongodb.operation.CommandOperationHelper.executeWrappedCommandProtocol(CommandOperationHelper.java:233)
at com.mongodb.operation.CommandOperationHelper.executeWrappedCommandProtocol(CommandOperationHelper.java:136)
at com.mongodb.operation.FindOperation$1.call(FindOperation.java:701)
at com.mongodb.operation.FindOperation$1.call(FindOperation.java:695)
at com.mongodb.operation.OperationHelper.withConnectionSource(OperationHelper.java:462)
at com.mongodb.operation.OperationHelper.withConnection(OperationHelper.java:406)
at com.mongodb.operation.FindOperation.execute(FindOperation.java:695)
at com.mongodb.operation.FindOperation.execute(FindOperation.java:83)
at com.mongodb.client.internal.MongoClientDelegate$DelegateOperationExecutor.execute(MongoClientDelegate.java:179)
at com.mongodb.client.internal.MongoIterableImpl.execute(MongoIterableImpl.java:132)
at com.mongodb.client.internal.MongoIterableImpl.iterator(MongoIterableImpl.java:86)
at org.grails.datastore.mapping.mongo.query.MongoQuery.executeQuery(MongoQuery.java:527)
at org.grails.datastore.mapping.mongo.query.MongoQuery.executeQuery(MongoQuery.java:464)
at org.grails.datastore.mapping.query.Query.doList(Query.java:589)
at org.grails.datastore.mapping.query.Query.list(Query.java:568)
at org.grails.datastore.gorm.GormStaticApi.list_closure20(GormStaticApi.groovy:608)
at groovy.lang.Closure.call(Closure.java:405)
... 5 more

```

### Environment Information

- **Operating System**: macOS
- **Grails Version:** 4.0.3
- **JDK Version:** 1.8.hs-adpt
- **Container Version (If Applicable):** MongoDB 3 Docker Image

### Example Application

- https://github.com/puneetbehl/mongodbdemo/tree/abstractEmbeddedMongo

Start by running the linked example application and reproducing Patient.list() with the embedded abstract Address hierarchy. Then inspect org.grails.datastore.bson.codecs.BsonPersistentEntityCodec.groovy and EmbeddedDecoder.groovy from the stack trace; done means the query returns patients with embedded address data without InstantiationException.

Written by the indexing model from the issue text.