Add CODEOWNERS and PULL REQUEST TEMPLATE files; implement Packagist update workflow

Author: mescalantea

.github/CODEOWNERS

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+*   @sequra/partnerships

.github/PULL_REQUEST_TEMPLATE.md

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+✂✂✂✂✂✂✂✂✂✂✂✂✂✂✂✂✂✂✂✂✂✂✂✂✂✂✂✂✂✂✂✂✂✂
+✂✂✂  REMOVE FROM THIS PART BEFORE SUBMITTING YOUR PULL REQUEST ✂✂✂
+✂✂✂✂✂✂✂✂✂✂✂✂✂✂✂✂✂✂✂✂✂✂✂✂✂✂✂✂✂✂✂✂✂✂
+
+Here are some friendly reminders before submitting your pull request:
+
+- There should be an issue describing the motivation for this change.
+- Everything should be well tested.
+- Check that you are not making any intensive/slow queries (provide db explain if necessary).
+- Migrations should be safe https://sequra.atlassian.net/wiki/display/EN/Safe+Operations+For+High+Volume+PostgreSQL
+
+YOU CAN REMOVE THE PARTS OF THE TEMPLATE THAT DO NOT APPLY TO YOUR PULL REQUEST
+
+✂✂✂✂✂✂✂✂✂✂✂✂✂✂✂✂✂✂✂✂✂✂✂✂✂✂✂✂✂✂✂✂✂✂
+✂✂✂  REMOVE UP TO THIS PART BEFORE SUBMITTING YOUR PULL REQUEST ✂✂✂
+✂✂✂✂✂✂✂✂✂✂✂✂✂✂✂✂✂✂✂✂✂✂✂✂✂✂✂✂✂✂✂✂✂✂
+
+ ### What is the goal?
+
+_Provide a description of the overall goal (you can usually use the one from the issue)_
+
+ ### References
+* **Issue:** _jira issue goes here, if suggesting a new feature or change, please discuss it in an issue first_
+* **Related pull-requests:** _list of related pull-requests (comma-separated): #1, #2_
+* **Sentry errors:** _list of links to Sentry errors (comma-separated): link1, link2_
+* **Any other references (AppSignal, Prometheus, ...):** _list of links to other references (comma-separated): link1, link2_
+
+ ### How is it being implemented?
+
+_Provide a description of the implementation_
+
+ ### Opportunistic refactorings
+
+_Have you improved the code/app in anyway? Explain what you did._
+
+ ### Caveats
+
+_If you find any, please describe all the special conditions._
+
+### Does it affect (changes or update) any sensitive data?
+
+_Check [Sensitive data list documentation](../blob/master/docs/sensitive_data/README.md) and [Sensitive data list](../blob/master/docs/sensitive_data/sensitive-data.yml)
+
+ ### How is it tested?
+
+_Automatic tests? Manual tests?_
+
+_If it cannot be tested explain why._
+
+_Add use cases if specs are incomplete or missing._
+
+ ### How is it going to be deployed?
+
+_If it does not require anything special, just write "Standard deployment". Otherwise, put the required steps._
+
+- [ ] _Step 1_
+- [ ] _Step 2_

.github/workflows/packagist.yml

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+name: Update Packagist
+
+on:
+  push:
+
+jobs:
+  update-packagist:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Notify Packagist
+        run: |
+          curl -XPOST -H 'Content-Type: application/json' \
+          "https://packagist.org/api/update-package?username=sequra&apiToken=${{ secrets.PACKAGIST_API_TOKEN }}" \
+          -d '{"repository":{"url":"https://github.com/sequra/integration-middleware"}}'