Name Rspack asset modules as bundles

[pastelsky]

Summary

• name Rspack asset-module outputs using the existing .bundle.<extension> convention
• preserve content hashes to avoid filename collisions
• add a patch changeset and extend the Rspack output regression test

This supersedes #74 with a branch based on current master.

Production reproductions

• create-hypercolor@0.2.1: previously rejected 086356b87dfc8832.json; now builds and reports the JSON asset
• create-fumadocs-app@16.1.11: previously rejected d0e276d531ae3131.js; now builds and reports the JavaScript asset

Verification

• yarn check
• yarn test (49 passed)
• yarn build
• end-to-end local builds of both production reproducers