Add full calculated measures support with quote/bracket/escaping fixes

- Add _ParseState class for consolidated quote/bracket/paren tracking
- Add _find_top_level_operator for finding operators outside quotes/brackets
- Add _find_matching_paren for balanced parenthesis matching
- Add _is_inside_quotes_or_brackets helper function
- Add _extract_aggregates_from_expression for complex measure extraction
- Add _contains_aggregate_function for optimized aggregate detection
- Add _wrap_column_refs_in_parens for arithmetic precedence
- Add _count_outer_parens for stripping outer parentheses
- Improve _escape_and_quote_columns with recursive operator handling
- Improve _convert_quoted_columns to convert standalone quotes
- Improve _is_number_literal to handle decimals and scientific notation
- Add KQL_AGG_PATTERN pre-compiled regex for performance
- Add PLR2004 to ignored ruff rules (magic numbers in tests)
- Add comprehensive unit tests for new functionality

Author: Alison Gim

pyproject.toml

@@ -67,6 +67,7 @@ lint.ignore = [
     "ARG002",  # Unused method argument
 
     "PLR0913", # Too many arguments in function definition
+    "PLR2004", # Magic value used in comparison (common in tests)
 ]
 
 [tool.ruff.lint.pycodestyle]