[Feature] defined mongo cdc schema on table_conf

### Search before asking

- [X] I searched in the [issues](https://github.com/apache/paimon/issues) and found nothing similar.

### Motivation

according to this issue https://github.com/apache/paimon/issues/4683

we find that mongo cdc change schema frequently，and can not query right value on starrock paimon cagalog

### Solution
we can defined a schema by set permanent type and filed to save it

like seatunnel we can defined a schema on mongo cdc table_conf
```

/bin/flink run \
/path/to/paimon-flink-action-0.9.0.jar \
mongodb_sync_table \
--warehouse hdfs:///path/to/warehouse \
--database test_db \
--table test_table \
--partition_keys pt \
--computed_column '_year=year(age)' \
--mongodb_conf hosts=127.0.0.1:27017 \
--mongodb_conf username=root \
--mongodb_conf password=123456 \
--mongodb_conf database=source_db \
--mongodb_conf collection=source_table1 \
--catalog_conf metastore=hive \
--catalog_conf uri=thrift://hive-metastore:9083 \
--table_conf bucket=4 \
--table_conf changelog-producer=input \
--table_conf sink.parallelism=4 \
--table_conf schema={
fields {
"_id" : int,
"name" : string,
"created" : datetime,
"isDelete" : boolean
}
}
```

### Anything else?

_No response_

### Are you willing to submit a PR?

- [ ] I'm willing to submit a PR!

Start by reviewing issue 4683 and the MongoDB sync table command shown in this issue. Determine how a permanent schema supplied through table_conf should be represented and applied; done means MongoDB CDC schema changes no longer cause incorrect query values in the Starrocks Paimon catalog.

Written by the indexing model from the issue text.