fix(service): biome/file_features still should return a map instead of an array

[siketyan]

Summary

Fixed a regression from #6662 that broke the playground. cc @arendjr

The FileFeaturesResult struct has changed in the PR, but it is also exposed to the WASM API and caused a type mismatch. I added a custom implementation of serde::Serialize, serde::Deserialize, and schemars::JsonSchema to keep it the same as before.

Test Plan

Manually tested with the playground

[changeset-bot]

⚠️ No Changeset found

Latest commit: 3c8eb7c

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[siketyan]

I skipped a changeset as the regression is not yet released.

[ematipico]

Thank you !