refactor(allocator): move Allocator into own module

[overlookmotel]

Pure refactor. oxc_allocator crate is getting quite crowded now. Move Allocator into a separate file.

[overlookmotel]

• refactor(allocator): move Allocator into own module #8656 👈 (View in Graphite)
• refactor(allocator): reduce repeat code to prevent Drop types in arena #8655
• main

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[codspeed-hq]

CodSpeed Performance Report

Merging #8656 will not alter performance

_{Comparing 01-22-refactor_allocator_move_allocator_into_own_module (ae8db53) with main (0f85bc6)}

Summary

✅ 32 untouched benchmarks

[Boshen]

Merge activity

• Jan 22, 8:45 AM EST: The merge label '0-merge' was detected. This PR will be added to the Graphite merge queue once it meets the requirements.
• Jan 22, 8:45 AM EST: A user added this pull request to the Graphite merge queue.
• Jan 22, 8:50 AM EST: A user merged this pull request with the Graphite merge queue.