Feat: Add Basic Lua Test Suite (#115)

This MR adds a Lua test suite to the project, run via busted, and introduces tests for a number of the utility functions. Subsequent work will have to be done to test functions that use the `vim.api` scope and external packages to the plugin.

.github/workflows/lua.yaml

@@ -0,0 +1,37 @@
+name: Lua
+on:
+  pull_request:
+    branches:
+      - main
+jobs:
+  lua_lint:
+    name: Lint Lua 💅 
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v3
+      - name: Luacheck linter
+        uses: lunarmodules/luacheck@v1
+        with:
+          args: --globals vim --no-max-line-length -- .
+  lua_format:
+    name: Formatting Lua 💅 
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v3
+      - name: Action
+        uses: JohnnyMorganz/stylua-action@v3
+        with:
+          token: ${{ secrets.GITHUB_TOKEN }}
+          version: latest
+          args: --check .
+  lua_test:
+    name: Test Lua 🧪 
+    needs: [lua_format,lua_lint]
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v3
+      - name: Run Busted
+        uses: lunarmodules/busted@v2.2.0