Add json parsing options in JsonStringDeserializationSchema

### Search before asking

- [x] I searched in the [issues](https://github.com/alibaba/fluss/issues) and found nothing similar.

### Description

As discussed in PR #770, similar to flink `JsonRowDataSerializationSchema`, we can also add several options for json parsing.

> private final TimestampFormat timestampFormat;
> private final JsonFormatOptions.MapNullKeyMode mapNullKeyMode;
> private final String mapNullKeyLiteral;
> private final boolean ignoreNullFields;

### Willingness to contribute

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