Add CodeQL config file

CodeQL.yml

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+path_classifiers:
+  test:
+    # Classify all files in the top-level directories test/ and testsuites/ as test code.
+    - test
+    # Classify all files with suffix `.test` as test code.
+    # Note: use only forward slash / as a path separator.
+    # *  Matches any sequence of characters except a forward slash.
+    # ** Matches any sequence of characters, including a forward slash.
+    # This wildcard must either be surrounded by forward slash symbols, or used as the first segment of a path.
+    # It matches zero or more whole directory segments. There is no need to use a wildcard at the end of a directory path because all sub-directories are automatically matched.
+    # That is, /anything/ matches the anything directory and all its subdirectories.
+    # Always enclose the expression in double quotes if it includes *.
+    - "**/*.test.ts"
+
+  # The default behavior is to tag all files created during the
+  # build as `generated`. Results are hidden for generated code. You can tag
+  # further files as being generated by adding them to the `generated` section.
+  generated:
+    # generated code.
+    - out
+    - "out-build"
+    - "out-vscode"
+    - "**/out/**"