feat(workflow & stylua): Enable CI (code style check)

Author: Jint-lzxy

.github/workflows/format_check.yml

@@ -0,0 +1,12 @@
+name: stylua
+on: [push, pull_request]
+
+jobs:
+  stylua:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v2
+      - uses: JohnnyMorganz/stylua-action@1.0.0
+        with:
+          token: ${{ secrets.GITHUB_TOKEN }}
+          args: --check --config-path=stylua.toml .

stylua.toml

@@ -0,0 +1,6 @@
+column_width = 120
+line_endings = "Unix"
+indent_type = "Tabs"
+indent_width = 4
+quote_style = "AutoPreferDouble"
+call_parentheses = "Always"