Support of custom sqldelete logic and DeleteMerge logic

[kanha-gupta]

Ref #28754
Changes proposed in this pull request:

1. Creation of a custom SqlDelete class to parse merge statements
2. Creation of a custom MergeDeleteOperation class to combine the statements of delete and merge together

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[kanha-gupta]

@strongduanmu please review :)

[kanha-gupta]

Hey @strongduanmu any updates with this PR ?