differentiate between pass-through and byte[] for DaprObjectSerializer

## Expected Behavior

byte[] can means 2 things.
* pass-through: do not serialize/deserialize the values. Sent/return the raw data. Other parts of the system will deal with raw data.
* normal byte[] values: serialize/deserialize them normally.

## Actual Behavior

Current [DaprObjectSerializer](https://github.com/dapr/java-sdk/blob/9296a8332336333ead172f460fb3b2209c446acb/sdk/src/main/java/io/dapr/serializer/DaprObjectSerializer.java#L15) does not differentiate between pass-through byte[] and normal byte[] values. The [DefaultObjectSerializer](https://github.com/dapr/java-sdk/blob/9296a8332336333ead172f460fb3b2209c446acb/sdk/src/main/java/io/dapr/serializer/DefaultObjectSerializer.java#L16) treats byte[] as always pass-through.

There are cases when serializing/deserializing byte[] as normal values is desired. For example, for json, it's desired to serialize byte[] as base64-encoded String because there's no other way to represent byte[] as legal JSON values.

I suggest to change the [DaprObjectSerializer](https://github.com/dapr/java-sdk/blob/9296a8332336333ead172f460fb3b2209c446acb/sdk/src/main/java/io/dapr/serializer/DaprObjectSerializer.java#L15) to follows:
```java
public interface DaprObjectSerializer {
default byte[] serialize(Object o) throws IOException {
// passThrough by default true, to make this not a breaking change.
return serialize(o, true);
}

byte[] serialize(Object o, boolean passThrough) throws IOException;

default T deserialize(byte[] data, TypeRef type) throws IOException {
return deserialize(data, type, true);
}

T deserialize(byte[] data, TypeRef type, boolean passThrough) throws IOException;

String getContentType();
}
```
and [DefaultObjectSerializer](https://github.com/dapr/java-sdk/blob/9296a8332336333ead172f460fb3b2209c446acb/sdk/src/main/java/io/dapr/serializer/DefaultObjectSerializer.java#L16) should be changed to honor explicit passThrough param.

## Steps to Reproduce the Problem

## Release Note

RELEASE NOTE:

Beginne mit sdk/src/main/java/io/dapr/serializer/DaprObjectSerializer.java und DefaultObjectSerializer.java und verwende die verknüpften Definitionen als Einstiegspunkte. Überprüfe, wie die explizite passThrough-Auswahl rohe byte[] von normal serialisierten byte[] unterscheiden soll, während das bestehende Standardverhalten erhalten bleibt; als erledigt gilt die Aufgabe, wenn beide Serializer diese Auswahl berücksichtigen.

Vom Indexierungsmodell aus dem Issue-Text verfasst.