[BitSail][Connector] FakeSource supports generating unique columns.

[BlockLiu]

Is your feature request related to a problem? Please describe

Current FakeSource supports generate unique long value. But sometimes we may want to generate more type of unique columns, like string or date.

This issue wants to support generate unique columns for the following type:

• int
• short
• string
• bigint
• date

Describe the solution you'd like

Describe alternatives you've considered

Additional context

[laglangyue]

I want to do this, but I have been busy parsing xml file schema (xsd file) recently, and I would finish this before next weekend.

[garyli1019]

@laglangyue sure! Assigned to you, please take your time.

[garyli1019]

@laglangyue hello, just checking how's everything going with this issue. We have a contributor group to discuss dev issue. Please feel free to join if you are interested

[laglangyue]

@laglangyue hello, just checking how's everything going with this issue. We have a contributor group to discuss dev issue. Please feel free to join if you are interested

yes，glad to join.