feat!: track parser revision in Lua

Problem: Tracking parser revision in lockfile and allowing override
through the parsers module complicates the code. In addition, only
revision changes are handled robustly, not changes to other installation
info.

Solution: Track parser revision in the parsers module directly. Reload
parser table on every install or update call. Support modifying parser
table in a `User TSUpdate` autocommand.

.github/workflows/update-readme.yml

@@ -32,10 +32,11 @@ jobs:
       - name: Create Pull Request
         uses: peter-evans/create-pull-request@v7
         with:
+          add-paths: SUPPORTED_LANGUAGES.md
           token: ${{ steps.app-token.outputs.token }}
           sign-commits: true
           commit-message: "bot(readme): update"
-          title: Update README
+          title: Update SUPPORTED_LANGUAGES.md
           body: "[beep boop](https://github.com/peter-evans/create-pull-request)"
           branch: update-readme-pr
           base: ${{ github.head_ref }}