Implement JSON type support across core transforms #5755

[S3tuit]

• Support JSON input field in JsonInput
• JSON Better interoperability with relational DBs and MongoDB
• Add unit and integration tests
• Complete the implementation of ValueMetaJson

Closes #5755.

Note: fix small bug in Round2 too.

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[S3tuit]

This merge also updates the Round2 getCode value, as it occasionally caused build failures in CalculatorMetaTest. The issue occurred because both Round1 and Round2 previously shared the same code.

[hansva]

Beautiful work @S3tuit!