ci: add code owners via codeowners-plus (#15261)

.codeowners

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+# Reference: https://github.com/marketplace/actions/codeowners-plus#codeowners-file-spec
+
+# Fallback: request Vaxry's review
+* @vaxerski
+
+# CI: request @fufexan's review
+.github/workflows/** @fufexan
+
+# Hyprtester (framework): CC @kolayne
+? hyprtester/src/* @kolayne

.github/workflows/codeownersplus.yml

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+name: 'Code Owners'
+
+concurrency:
+  group: codeowners-${{ github.ref }}
+  cancel-in-progress: true
+
+on:
+  pull_request:
+    # Note: to support more features of codeowners-plus, more event triggers
+    # may be required. See https://github.com/marketplace/actions/codeowners-plus
+    types: [opened, reopened, synchronize, ready_for_review]
+
+permissions:
+  contents: read       # required for @actions/checkout
+  pull-requests: write # required to request reviewers and leave comments
+
+jobs:
+  codeowners:
+    name: 'Run Codeowners Plus'
+    runs-on: ubuntu-latest
+    steps:
+      - name: 'Checkout Code Repository'
+        uses: actions/checkout@v7
+        with:
+          fetch-depth: 0
+
+      - name: 'Codeowners Plus'
+        uses: multimediallc/codeowners-plus@v1.9.1
+        with:
+          github-token: '${{ secrets.GITHUB_TOKEN }}'
+          pr: '${{ github.event.pull_request.number }}'
+          verbose: true
+          quiet: ${{ github.event.pull_request.draft }}

codeowners.toml

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+# Prevent codeowners-plus from adding a review status comment:
+# we only use it to request reviews, not to enforce approvals.
+#
+# Optional reviewers are still invited with a CC comment.
+disable_review_status_comments = true
+
+[enforcement]
+# Just request reviews, but do not enforce the approvals requirement.
+#
+# If `fail_check = true`, the codeowners-plus workflow will fail, unless sepcified reviewers
+# approve the PR.
+fail_check = false