fix: add telegram bot, codeowners, PR template

Author: agonzalezv

.github/CODEOWNERS

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+# Global owners
+
+* Metasig/devs

.github/pull_request_template.md

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+# Summary
+
+- One-line summary of the change and why it matters.
+
+## Context
+
+- Links: issue, ticket, or related PRs.
+
+## Changes
+
+- Short bullet list of the key changes made.
+
+## Checklist
+
+- [ ] Tests added/updated
+- [ ] Docs updated (if needed)
+
+## Risks
+
+- Brief note about possible risks or impact.
+
+## How to test
+
+- Short, reproducible steps to verify the change.
+z

.github/telegram-notification.yml

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+name: Telegram notification
+
+on:
+  pull_request:
+    types: [opened, reopened]
+
+jobs:
+  telegram-bot:
+    name: Telegram Bot
+    runs-on: ubuntu-latest    
+    steps:
+      - name: Telegram Notify
+        uses: appleboy/telegram-action@master
+        with:
+          to: ${{ secrets.TELEGRAM_TO }}
+          token: ${{ secrets.TELEGRAM_TOKEN }}
+          format: markdown
+          disable_web_page_preview: true
+          message: |
+            ${{ github.event.pull_request.draft && '📝 New draft PR' || '🔔 New PR' }} by: *${{ github.event.pull_request.user.login }}*
+            *${{ github.event.pull_request.title }}*
+            🔍 ${{ github.event.pull_request.html_url }}