Add codeowners and pull request template

Author: CarlosMecha

.github/CODEOWNERS

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+*   @segmentio/destinations-team @segmentio/golden-team

.github/PULL_REQUEST_TEMPLATE.md

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+
+**What does this PR do?**
+
+
+**Are there breaking changes in this PR?**
+
+
+**Has this been tested end-to-end? Please provide screenshots on how the fix now populates in the end tool. If not, what was done to test?**
+
+
+**Any background context you want to provide?**
+
+
+**Is there parity with the server-side/android/iOS integration (if applicable)?**
+
+
+**Does this require a metadata change? If so, please link the PR from https://github.com/segmentio/destination-scripts.**
+
+
+**What are the relevant tickets?**
+
+
+**Link to CC ticket**
+
+
+**List all the tests accounts you have used to make sure this change works**
+
+
+**Helpful Docs**
+