[WIP][Common] The abstraction of Incremental Snapshot Framework

[YesOrNo828]

Add a new module(flink-connector-base) which contain the common abstraction of incremental snapshot framework. So other db connectors could implement the Incremental Snapshot algorithm more easier. #724

[leonardBang]

Thanks @YesOrNo828 for the awesome work , I think we're in right way.
I left several comments, and I think we can introduce a moudlue/connector like mysql-connecor-cdc-new which depends on our new framework, this won't influence current connector and help to validate our design in POC.
BTW, we can rebase master where I fix a log issue that prevent we look LOG in IDE.

[YesOrNo828]

@leonardBang Thanks for you reviewing.
I have rebased my branch.
And adding new module to validate the new framework that idea is good to me. I will do more test work.

[leonardBang]

@YesOrNo828 @GOODBOY008 I help fix the code style and conflicts, we can review&develop base on current code base.

[yangrong688]

Hi @YesOrNo828, @leonardBang , does this feature can apply to postgres-cdc when it complete.

[leonardBang]

Thanks @YesOrNo828 for the great work, I make some improvement base on your work, I think it's ok to merge now as the first version of framework.

[leonardBang]

+1

[1032851561]

Hi @YesOrNo828, @leonardBang , does this feature can apply to postgres-cdc when it complete.

+1