ci: add typo checking

typos is a powerful source code spell checker.

Adds a CI job that runs on every PR and
push to master (but can also be run manually with
workflow_dispatch) that checks for typos.

Adds a config file .typos.toml that deals with
false positives and only checks for top-level/one-level
.mediawiki and .md files.

.github/workflows/github-action-checks.yml

@@ -20,3 +20,12 @@ jobs:
         with:
           fetch-depth: 2
       - run: scripts/diffcheck.sh
+  Typo-Checks:
+    name: "Typo Checks"
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout Actions Repository
+        uses: actions/checkout@v4
+
+      - name: Check spelling
+        uses: crate-ci/typos@master