Use build-and-inspect-python-package action

This uses https://github.com/hynek/build-and-inspect-python-package to ensure our package is correct, both during testing and deploy,

.github/workflows/test.yml

@@ -189,3 +189,10 @@ jobs:
         fail_ci_if_error: true
         files: ./coverage.xml
         verbose: true
+        
+  check-package:
+    runs-on: ubuntu-latest
+    steps:
+    - uses: actions/checkout@v3
+    - name: Build and Check Package
+      uses: hynek/build-and-inspect-python-package@v1.5