Add component owner action (#655)

.github/component_owners.yml

@@ -0,0 +1,4 @@
+components:
+
+  sdk-extension/opentelemetry-sdk-extension-aws:
+    - NathanielRN

.github/workflows/component-owners.yml

@@ -0,0 +1,16 @@
+# This action assigns and requires approval from owners of components for
+# PRs that are open against those components. Components are defined as
+# individual paths within this repository.
+name: 'Component Owners'
+
+on:
+  pull_request:
+    branches:
+      - main
+
+jobs:
+  run_self:
+    runs-on: ubuntu-latest
+    name: Auto Assign Owners
+    steps:
+      - uses: dyladan/component-owners@main