refactor(ast): move custom types .d.ts file

[overlookmotel]

We have a few manually-defined TS types in oxc_ast crate. Move that .d.ts file out of src folder, and name it more descriptively.

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[overlookmotel]

• refactor(ast): move custom types .d.ts file #6931 👈
• refactor(napi): move custom types to bottom of file #6930
• refactor(napi): types file in root of types package #6929
• main

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[codspeed-hq]

CodSpeed Performance Report

Merging #6931 will not alter performance

_{Comparing 10-26-refactor_ast_move_custom_types_.d.ts_file (4483f89) with main (4cf0085)}

Summary

✅ 30 untouched benchmarks

[Boshen]

Merge activity

• Oct 26, 1:09 PM EDT: The merge label '0-merge' was detected. This PR will be added to the Graphite merge queue once it meets the requirements.
• Oct 26, 1:09 PM EDT: A user added this pull request to the Graphite merge queue.
• Oct 26, 1:16 PM EDT: A user merged this pull request with the Graphite merge queue.