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Improve round() function return type handling based on input arguments data types (#3592)

Make the round() function clearer on return types based on argument types and number of arguments (#3592)

This is a cherry-pick commit from BABEL_4_X_DEV (#3567).

Changes:

    Add lookup functions for data types that are represented differently
    Introduce PLpgSQL functions for each return type to reuse the existing underlying C functions
    Implement logic to determine return types based on argument types and number of arguments
    Add tests to ensure comprehensive coverage

Task: BABEL-2057

Signed-off-by: RUI LUO <rluo@amazon.com>
Co-authored-by: RUI LUO <rluo@amazon.com>

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