[WIP][][SQL] Introduction of Custom Exceptions for Sql Scripting

[miland-db]

What changes were proposed in this pull request?

Previous PRs introduced basic changes for SQL Scripting. This PR is a follow-up to introduce custom exceptions that can arise while using SQL Scripting language.

Why are the changes needed?

The intent is to add precise errors for various SQL scripting concepts.

Does this PR introduce any user-facing change?

Users will now see specific SQL Scripting language errors.

How was this patch tested?

There are tests for newly introduced parser changes:

SqlScriptingParserSuite - unit tests for execution nodes.

Was this patch authored or co-authored using generative AI tooling?

No.