Automatically label pull requests based on the file paths modified (#1273)

* Automatically label pull requests based on the file paths modified

* Add `wasmtime:c-api` labels for changes to `crates/c-api/*`

.github/workflows/labeler.yml

@@ -0,0 +1,11 @@
+name: "Pull Request Labeler"
+on:
+- pull_request
+
+jobs:
+  triage:
+    runs-on: ubuntu-latest
+    steps:
+    - uses: actions/labeler@v2
+      with:
+        repo-token: "${{ secrets.GITHUB_TOKEN }}"