feat: function to get range of key/value in model block

[benfdking]

Stages of the changes

• refactor: refactor dialect parsing code to be reused
• feat: add the ability to return range for key and value

Actual changes

• improved the parsing logic and made it more robust
• added the ability to return the value for the value range as well

[Copilot]

Pull Request Overview

This PR adds the ability to return ranges for both the key and its value when parsing MODEL block properties, improving upon the previous implementation that only returned the key range.

• Refactored the dialect parsing code to be more robust and reusable
• Enhanced the get_range_of_a_key_in_model_block function to return both key and value ranges as a tuple
• Added comprehensive test coverage for various MODEL block property types and structures

Reviewed Changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 3 comments.

File	Description
sqlmesh/core/linter/helpers.py	Complete rewrite of get_range_of_a_key_in_model_block to parse nested parentheses and return both key and value ranges
tests/core/linter/test_helpers.py	Updated tests to handle the new tuple return format and added specific test cases for different value types

[Copilot]

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