GitHub Actions: Add codespell to find typos

Use https://github.com/codespell-project/actions-codespell to discover typos like #743, #745, #746, #747, #748

Author: cclauss

.github/workflows/macOS-tests.yml

@@ -34,6 +34,10 @@ jobs:
       cancel-in-progress: false
     steps:
       - uses: actions/checkout@v3
+      - uses: codespell-project/actions-codespell@v1
+        with:
+          ignore_words_list: ans,deriver,inout,packag
+          skip: "*.js,*WordLists.swift"
       - name: Resolve dependencies
         run: swift package resolve
       - name: Build