chore: add formatting workflow and stylua.toml

These should ensure consitent formatting in the future.

Feel free to modify the stylua.toml to your liking. I tried to keep it consistent with our current style (especially the tab-based indention)

.github/workflows/lua-format-check-pr.yml

@@ -0,0 +1,16 @@
+name: Check Lint With Stylua
+on:
+  pull_request:
+    paths:
+      - "**.lua"
+jobs:
+  format_code:
+    if: github.repository != github.event.pull_request.base.repo.full_name # if not a local branch
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v3
+      - uses: JohnnyMorganz/stylua-action@v3
+        with:
+          token: ${{ secrets.GITHUB_TOKEN }}
+          version: latest
+          args: --check .

.github/workflows/lua-format-push.yml

@@ -0,0 +1,21 @@
+name: Lint With Stylua
+on:
+  push:
+    paths:
+      - "**.lua"
+  workflow_dispatch:
+jobs:
+  format_code:
+    runs-on: ubuntu-latest
+    permissions:
+      contents: write
+    steps:
+      - uses: actions/checkout@v3
+      - uses: JohnnyMorganz/stylua-action@v3
+        with:
+          token: ${{ secrets.GITHUB_TOKEN }}
+          version: latest
+          args: .
+      - uses: stefanzweifel/git-auto-commit-action@v4
+        with:
+          commit_message: "chore: linting with Stylua"

.luarc.json

@@ -1,6 +1,5 @@
 {
-    "$schema": "https://raw.githubusercontent.com/sumneko/vscode-lua/master/setting/schema.json",
-    "Lua.diagnostics.globals": [
-        "autocomplete"
-    ]
-}
+  "$schema": "https://raw.githubusercontent.com/sumneko/vscode-lua/master/setting/schema.json",
+  "Lua.diagnostics.globals": ["autocomplete"],
+  "unusedLocalExclude": ["_*"]
+}

stylua.toml

@@ -0,0 +1,9 @@
+column_width = 120
+line_endings = "Unix"
+indent_type = "Tabs"
+quote_style = "AutoPreferDouble"
+call_parentheses = "Always"
+collapse_simple_statement = "ConditionalOnly"
+
+[sort_requires]
+enabled = true