chore: add CODEOWNERS and PR template

.github/CODEOWNERS

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+* @ulises-jeremias

.github/dependabot.yml

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+version: 2
+updates:
+  - package-ecosystem: "github-actions"
+    directory: "/"
+    schedule:
+      interval: "weekly"
+    open-pull-requests-limit: 5

.github/pull_request_template.md

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+## Description
+<!-- What does this PR do? Link related issues with `Closes #<num>`. -->
+
+## Type of Change
+- [ ] Bug fix
+- [ ] New feature
+- [ ] Breaking change
+- [ ] Documentation / chore
+- [ ] PKGBUILD update
+
+## How Has This Been Tested?
+<!-- Steps to verify -->
+
+## Checklist
+- [ ] Self-review done
+- [ ] Tests pass locally
+- [ ] PKGBUILD validated (`makepkg --printsrcinfo` / `shellcheck PKGBUILD` / `namcap` if applicable)