* support 'recover index' in clustered index table
* ddl: add truncate to buildCommonHandleFromChunkRow
* executor: truncate the updated handle
* executor: set core.HandleCols in the initialization of RecoverIndexExec
* refine code
* remove unused code
* fix integration test
* fix integration test
* address comment
* early return when recovering clustered pk
* remove panic
Co-authored-by: ti-srebot <66930949+ti-srebot@users.noreply.github.com>