SP-12206: Add codeowners and PR template

Author: GubinAlexander

.github/CODEOWNERS

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+* @regulaforensics/backend-team

.github/pull_request_template.md

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+# Description
+
+<!-- Please include a summary of the changes. -->
+
+# Ticket link
+
+<!-- Please include all the tickets links related with this change -->
+
+# Change type
+
+<!-- Please select the change type -->
+
+- [ ] Bug fix <!-- (non-breaking change which fixes an issue) -->
+- [ ] New feature <!-- (non-breaking change which adds functionality) -->
+- [ ] Breaking change <!-- (fix or feature that would cause existing functionality to not work as expected) -->
+- [ ] Add/Update documentation
+
+# Notes
+
+<!-- Please include any other relavant information here -->