perf(vapor): pack createIf metadata into flags

[edison1105]

Summary by CodeRabbit

• Refactor

  • Improved internal handling of conditional directives in Vapor mode with a flags-based encoding system for more efficient code generation.

• Tests

  • Added comprehensive test coverage for conditional directive behavior, including once-directives, branch handling, and keyed branches.

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✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch edison/perf/createIfSize

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commit: 32f7539