CI: add typos action (#1264)

Automatically check repo for typos, which should hopefully cut down on
typo correction PRs:

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

Author: tony-iqlusion

.github/workflows/workspace.yml

@@ -48,3 +48,9 @@ jobs:
         with:
           command: fmt
           args: --all -- --check
+
+  typos:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+      - uses: crate-ci/[email protected]

.typos.toml

@@ -0,0 +1,5 @@
+[files]
+extend-exclude = [
+    ".git/",
+    "bip32/tests/bip32_vectors.rs",
+]