feat(devops): Add codeowners, dependabot and PR template (#7)

.github/CODEOWNERS

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+# The codebase is owned by the Governance & Identity Experience team at DFINITY
+# For questions, reach out to: <[email protected]>
+.github/CODEOWNERS @dfinity/gix
+# The GIX team members who maintain this repo:
+* @bitdivine

.github/dependabot.yml

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+# Please see the documentation for all configuration options:
+# https://docs.github.com/en/enterprise-cloud@latest/code-security/dependabot/dependabot-version-updates
+
+version: 2
+updates:
+  - package-ecosystem: "cargo"
+    directory: "/"
+    schedule:
+      interval: "weekly"
+  - package-ecosystem: "npm"
+    directory: "/"
+    schedule:
+      interval: "weekly"

.github/pull_request_template.md

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+# Motivation
+
+<!-- Describe the motivation that lead to the PR -->
+
+# Changes
+
+<!-- List the changes that have been developed -->
+
+# Tests
+
+<!-- Please provide any information or screenshots about the tests that have been done -->