Use Austruck literals instead of JSON in e2e tests

[MidnightDesign]

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[Copilot]

Pull Request Overview

This PR converts e2e test files from using JSON syntax to Austruck literals for better consistency with the language being tested. The changes update test input and output data format while adding proper parsing support for boolean literals and extending the literal hierarchy.

Key changes:

• Updated test files to use Austruck literal syntax instead of JSON (removing quotes from object keys)
• Added boolean literal parsing support (true/false keywords)
• Introduced AbstractLiteral base class with value() method for literal value extraction

Reviewed Changes

Copilot reviewed 23 out of 23 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
tests/unit/cases/struct/field-access-on-aliased-struct-in-lambda.txt	Updated JSON syntax to Austruck literals in test data
tests/unit/cases/struct/equality/*.txt	Converted JSON object syntax to Austruck struct literals
tests/unit/cases/or/*.txt	Updated boolean test data from JSON to Austruck format
tests/unit/cases/map/equals-three.txt	Changed array test data to use Austruck syntax
tests/unit/cases/eq/*.txt	Updated integer comparison test inputs to Austruck format
tests/unit/cases/atomic/literal/*.txt	Added new boolean literal test cases
tests/unit/cases/atomic/get/with-inline-type.txt	Updated string test data to Austruck format
tests/unit/E2eCase.php	Modified test parser to use ExpressionParser instead of JSON parsing
src/StructLiteral.php	Extended AbstractLiteral and added value() method implementation
src/Parser/Token.php	Updated type annotations to include boolean literals
src/Parser/ParsedToken.php	Extended generic type to include boolean values
src/Parser/Literal.php	Updated type constraints to support boolean literals
src/Parser/ExpressionParser.php	Added parsing support for true and false keywords
src/Literal.php	Extended AbstractLiteral and implemented value() method
src/ListLiteral.php	Extended AbstractLiteral and added value() method implementation
src/AbstractLiteral.php	New abstract base class for all literal expressions

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