refactor(ast): add ast_builder Cargo feature

[overlookmotel]

Part of #23043.

Add ast_builder Cargo feature to oxc_ast crate. Feature is enabled by default - no breaking change.

This prepares the way to bring in new AstBuilder implementation.

[overlookmotel]

Warning

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• refactor(parser): switch parser to new AstBuilder #23730
• feat(ast): add methods to create primitives to new AstBuilder #23729
• feat(ast): add custom builder methods to AST types #23651
• feat(ast): add AST creation methods to AST types #23650
• refactor(ast): add ast_builder Cargo feature #23649 👈 (View in Graphite)
• perf(transformer/object-rest-spread): reduce iteration #23720
• perf(transformer): allocate AST nodes in arena directly #23711
• perf(parser): allocate AST nodes in arena directly #23712
• perf(minifier): allocate AST nodes in arena directly #23710
• perf(isolated_declarations): allocate AST nodes in arena directly #23709
• refactor(ast): remove AstBuilder::alloc calls #23708
• main

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[codspeed-hq]

Merging this PR will not alter performance

✅ 62 untouched benchmarks
⏩ 9 skipped benchmarks¹

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_{Comparing om/06-06-refactor_ast_add_ast_builder_cargo_feature (f40235d) with main (5527bef)}

Footnotes

1. 9 benchmarks were skipped, so the baseline results were used instead. If they were deleted from the codebase, click here and archive them to remove them from the performance reports. ↩

[overlookmotel]

Superceded by #23743.