Add identifierExpressionUtils

[JordanBoltonMN]

1. Adds identifierExpressionUtils
2. Adds assertNormalizedPath for identifierUtils
3. Allows hash keywords as identifiers

[Copilot]

Pull Request Overview

This PR enhances identifier handling in the PowerQuery parser by adding support for identifier expressions and hash keywords as identifiers. The changes introduce new utilities for processing identifier expressions with '@' prefixes and expand identifier support to include hash keywords like #table.

• Added IdentifierExpressionUtils module for handling identifier expressions with '@' prefixes
• Enhanced identifierUtils to support hash keywords as valid identifiers
• Added assertNormalizedPath utility function for identifier validation

Reviewed Changes

Copilot reviewed 6 out of 7 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
src/test/libraryTest/identifierExpressionUtils.test.ts	New comprehensive test suite for identifier expression utilities
src/test/libraryTest/identifierUtils.test.ts	Added test case for hash keyword identifier support
src/powerquery-parser/language/identifierExpressionUtils.ts	New utility module for processing identifier expressions with '@' prefixes
src/powerquery-parser/language/identifierUtils.ts	Added hash keyword support and assertNormalizedIdentifier function
src/powerquery-parser/language/index.ts	Export declaration for new IdentifierExpressionUtils module
package.json	Version bump to 0.18.1

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