Added DataSource module

[wolfboys]

[Kyofin]

I am willing contribute this module.

[wolfboys]

I am willing contribute this module.

great !!! 👍👍👍

[Whojohn]

@wolfboys

I can finish kafka datasource which inlclude : json auto infer and so on.

• The feature may include:

1. (promise) flink kafka catalog .
2. (promise) json -> flink sql logicalType infer.
3. (non promise) user privilege

User privilege depends on StreamGraph to analysis which need some trick which will change the sql commit way.(Difference with streamxpark done .)

• Detail

Catalog

1. Meta center control physic column define.
2. Create / hints to support : (Schema# All schema type) . Such as : primary key define, watermark ,timestamp define and logical column.

Json infer

1. Auto infer json type to Flink sql logicalType.

[wolfboys]

Expired proposal