Support Oracle merge statement convert to SqlMerge to improve sql federation support

[strongduanmu]

Background

On the master branch, SQLNodeConverterEngine already supports the conversion of most SelectStatement statements, which provides a good foundation for sql federation. In order to improve the support of sql federation for merge statement, we need to support the conversion of MergeStatement in SQLNodeConverterEngine.

Oracle merge statement doc - https://docs.oracle.com/en/database/oracle/oracle-database/21/sqlrf/MERGE.html#GUID-5692CCB7-24D9-4C0E-81A7-A22436DC968F

Task

• [ ] add MergeStatementConverter implement
• [ ] add MergeStatementConverter call logic in SQLNodeConverterEngine
• [ ] add merge statement convert test case in resources/converter directory

[kanha-gupta]

@strongduanmu Please assign :)

[strongduanmu]

@kanha-gupta Welcome, I just assign this issue to you.

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