Move process-related files from bindings/ to api/process/:
- BunProcess, ProcessBindingBuffer, ProcessBindingConstants
- ProcessBindingFs, ProcessBindingHTTPParser, ProcessBindingNatives
- ProcessBindingTTYWrap, ProcessBindingUV, ProcessIdentifier
- bun-spawn
Part of source code reorganization to make code location "guessable".
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Co-Authored-By: Claude <noreply@anthropic.com>