Add esbuild bundle script

[isaachinman]

Fixes #961

[vercel]

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[micheleriva]

I'll review this asap, sorry for the delay 🙏

[thatjuan]

Superseded by #1026, now merged. Rather than shipping a bundled artifact, #1026 fixes this at the source: it extracts fetchDocuments/fetchDocumentsWithDistinct out of methods/search.ts into their own module so the per-mode search modules no longer import search.ts back — removing the circular dependency entirely. That fixes it for every bundler (no bundle export condition or esbuild postbuild for consumers to opt into) and keeps the build bundler-free, which avoids the ESM↔CJS concern raised in #961. Thanks for the clear repro and the example PR — they made the root cause easy to pin down. Closing in favor of #1026.