Cassandra UDT not being persisted in cassandra database

まだ誰も着手していません。

### Describe the bug

The code converts Json object in request payload to string for UDT. We debugged and found the issue with Cassandra.prototype.create function in loopback-connector-cassandra/lib/cassandra.js. Please provide the solution for the issue.

### Logs

```shell
Payload object:
{
id: 'c',
name: 'otlsgy4',
phone: '88774622572',
address: {
street: 'Sahastradhara Road',
city: 'Dehradun',
state_or_province: 'Uttarakhand',
postal_code: '248001',
country: 'India'
}
}

Insert Query by loopback:
INSERT INTO "hotels"("id","name","phone","address") VALUES(?,?,?,?) [
'c',
'otlsgy4',
'88774622572',
'{"street":"Sahastradhara Road","city":"Dehradun","state_or_province":"Uttarakhand","postal_code":"248001","country":"India"}'
]

Expected Result:
INSERT INTO "hotels"("id","name","phone","address") VALUES(?,?,?,?) [
'c',
'otlsgy4',
'88774622572',
{"street":"Sahastradhara Road","city":"Dehradun","state_or_province":"Uttarakhand","postal_code":"248001","country":"India"}
]
```

### Additional information

_No response_

### Reproduction

https://github.com/nishankpathak/cassandrademo

@dhmlau

loopback-connector-cassandra/lib/cassandra.js の Cassandra.prototype.create から始め、リンクされた cassandrademo の例を使って問題を再現します。INSERT パラメーターで address UDT がどのようにバインドされるかを追跡します。UDT が JSON 文字列ではなく Cassandra の構造化データとして永続化されれば完了です。

索引モデルが issue の本文から書いたものです。