babelfish-for-postgresql / babelfish_extensions / 10183417649

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Added wrapper function for Substring to handle binary datatypes and multibyte character (#2815)

This commit aims to fix following issue --

1. SUBSTRING() function with last argument missing raises strange error message.
2. SUBSTRING() should work on [VAR]BINARY, Image argument.

In order to fix these issues,  added error message handling in ANTLR parser to throw appropriate error message for
different number of arguments. Also, added wrapper function handling for SUBSTRING() function to handle binary
datatypes and multibyte characters.

Engine PR: babelfish-for-postgresql/postgresql_modified_for_babelfish#415

Task: BABEL- 4118, BABEL- 3658
Signed-off-by: Anikait Agrawal <agraani@amazon.com>

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