Add lockfiles, and update parcel/core (#58)

- [Add] Lockfile added. This prevented dependabots from working. This is an issue since 20th Jan 2025 per https://github.blog/changelog/2025-01-20-dependabot-will-no-longer-support-npm-v6/. Although we don't specify an npm version, because lock files were not included, npm failed. see related issue open-telemetry/opentelemetry.io#6007 (comment).
- [bump] Update `parcel/core` to v12.12.0 to match all other parcel versions
- [Add] Add `parcel/config-default` as explicit dependency as we use this in the `.parcelrc` config. This previously worked when the repository was at v2.9.3.

.gitignore

@@ -5,8 +5,6 @@ output/
 
 .DS_Store
 *.log
-package-lock.json
-yarn.lock
 
 # Test files
 test/out/