chore: Add CODEOWNERS and automatic issue labels (#11)

.github/CODEOWNERS

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+* @looker-open-source/looker-embed-demo-team

.github/workflows/p3-issue-label.yml

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+name: Label all new/reopened issues with P3
+on:
+  issues:
+    types:
+      - reopened
+      - opened
+jobs:
+  label_issues_p3:
+    runs-on: ubuntu-latest
+    permissions:
+      issues: write
+    steps:
+      - uses: actions/github-script@v6
+        with:
+          script: |
+            github.rest.issues.addLabels({
+              issue_number: context.issue.number,
+              owner: context.repo.owner,
+              repo: context.repo.repo,
+              labels: ["p3"]
+            })

.github/workflows/triage-issue-label.yml

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+name: Label issues that need triage
+on:
+  issues:
+    types:
+      - opened
+jobs:
+  label_issues_p3:
+    runs-on: ubuntu-latest
+    permissions:
+      issues: write
+    steps:
+      - uses: actions/github-script@v6
+        with:
+          script: |
+            github.rest.issues.addLabels({
+              issue_number: context.issue.number,
+              owner: context.repo.owner,
+              repo: context.repo.repo,
+              labels: ["need triage"]
+            })