chore(config): set up CODEOWNERS file to automatically mark reviewers #…

…1791

ISSUE: #1791

SEE: https://docs.github.com/en/repositories/managing-your-repositorys-settings-and-features/customizing-your-repository/about-code-owners

CHANGELOG:
- [ ] Add a `CODEOWNERS` configuration file to automatically assign code
  reviewers based on changed files.

CODEOWNERS

@@ -0,0 +1,18 @@
+# General.
+# TODO: Add groups.
+*                   @pavelgj
+
+# Python-related.
+*.py                @pavelgj @yesudeep @irillit
+pyproject.toml      @pavelgj @yesudeep @irillit
+py/*                @pavelgj @yesudeep @irillit
+
+# Go-related.
+*.go                @apascal07
+go/*                @apascal07
+
+# JavaScript-related.
+*.js                @pavelgj
+*.ts                @pavelgj
+js/*                @pavelgj
+package.json        @pavelgj