ci: add a typo checker based on typos

https://github.com/crate-ci/typos

.github/workflows/spellchecker.yml

@@ -0,0 +1,13 @@
+name: spell checking
+on: [pull_request]
+
+jobs:
+  typos:
+    name: Spell Check with Typos
+    runs-on: ubuntu-latest
+    steps:
+    - name: Checkout Actions Repository
+      uses: actions/checkout@v4
+    - name: typos-action
+      uses: crate-ci/[email protected]
+

.typos.toml

@@ -0,0 +1,11 @@
+[default]
+locale = "en-us"
+
+[default.extend-words]
+FROMM ="FROMM" # this one is intentionally written with a typo
+unmarshaling ="unmarshaling" # this one is expected in golang
+
+[files]
+# excluded file
+# go.sum and go.mod contains URLs with hash, they can provide false positive
+extend-exclude = ["go.sum","go.mod"]