chore(github): add CODEOWNERS for PR review assignments

[Sunny6889]

What does this PR do?
Define per-module code owners covering all top-level Gradle modules, CI/build config, key sub-packages (db, net, vm, jsonrpc, rpc, http, event, config, backup, metrics, rewards, lite, test), and a default fallback owner for unmatched paths.

Why are these changes required?

This PR has been tested by:

• Unit Tests
• Manual Testing

Follow up

Extra details

Summary by CodeRabbit

• Chores
  • Updated repository configuration for pull request review assignments.

[coderabbitai]

Caution

Review failed

The pull request is closed.

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: 8e3fe4ad-8d87-46e6-9a7c-d174876d7477

📥 Commits

Reviewing files that changed from the base of the PR and between bb8b4be and 6bea1fb.

📒 Files selected for processing (1)

• .github/CODEOWNERS

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📝 Walkthrough

Walkthrough

A .github/CODEOWNERS file was added to define default and path-specific code ownership across the repository's Gradle modules, CI/build directories, and nested subdirectories for pull request review routing.

Changes

Cohort / File(s)	Summary
Code Ownership Configuration .github/CODEOWNERS	Added repository code ownership rules specifying default owners and path-specific reviewers for Gradle modules (framework, chainbase, consensus, protocol, common, crypto, plugins, docker), CI/build files (.github, gradle), and nested subdirectories (database/storage, trie, networking, VM/TVM, JSON-RPC, events, logs, configuration, backups, metrics, rewards, lite), plus test directories.

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~3 minutes

Poem

🐰 A file to claim the burrows we keep,
CODEOWNERS marks the territory deep,
Each module finds its guardian true,
Pull requests now know where to brew! 📋✨

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch feature_code_owners

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