feat: add LEFT-side infrastructure for Phase 3-5 FULL join support

[poyrazK]

Summary

• Add ClusterManager storage methods for LEFT side (mirror of RIGHT side methods)
• Add new RPC types: UnmatchedLeftRowsReport, FetchUnmatchedLeftRows
• Add new RPC structs: UnmatchedLeftRowsReportArgs, FetchUnmatchedLeftRowsArgs
• Add handlers in main.cpp for the new RPC types

Test plan

• All relevant tests pass locally (operator_tests, distributed_tests)
• CI passes

Notes

This is purely infrastructure - Phase 3-5 remains disabled. No functionality change.

Part of Option C implementation for FULL JOIN support.

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ℹ️ Review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: 63b47c6a-1545-4069-80a8-89c3c021ce50

📥 Commits

Reviewing files that changed from the base of the PR and between 62cd75e and 6018443.

📒 Files selected for processing (3)

• include/common/cluster_manager.hpp
• include/network/rpc_message.hpp
• src/main.cpp

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch feature/full-join-option-c-infrastructure

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[poyrazK]

Lets add those connections our core engine