Create JobExecutionSourceChunk & DB table

Entity will represent a chunk within JobExecution.

• The data structure is defined in the table

  Column name	Data type	Constraints	Description
  Id	UUID	PK	Chunk ID, Primary Key
  JobExecutionId	UUID	FK NN	Foreign Key to the Job Execution \n this chunk belongs to
  Last	Boolean	NN	True if this is the last chunk False otherwise
  State	State	NN	Represents the current state of the chunk processing Possible values: *InProgress, Completed, Error*
  ChunkSize	Int	NN	The total number of records in the chunk
  ProcessedAmount	Int	NN, def = 0	The number of records \n which have been processed already
  CreatedDate	DateTime	NN	Instant when chunk processing was started
  CompletedDate	DateTime		Instant when chunk processing was completed
  Error	String		Contains an error message and trace stack if the chunk processing has failed \n Makes sense only if *State == Error*

• There should be a JSON schema defined and a corresponding DB table to store data
• DAO which provides CRUD API to deal with chunks
• REST endpoints are not needed at this stage.
• Test are out or scope for this story.