feat: multi-group raft and leader-aware routing

[poyrazK]

Implementation of Phase 7 (Steps 1-3): Multi-Raft manager, leader-aware routing in DistributedExecutor, and stable RPC teardown.

[coderabbitai]

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📥 Commits

Reviewing files that changed from the base of the PR and between 5c44faf and 53f2616.

📒 Files selected for processing (17)

• CMakeLists.txt
• include/catalog/catalog.hpp
• include/common/cluster_manager.hpp
• include/distributed/raft_group.hpp
• include/distributed/raft_types.hpp
• include/executor/query_executor.hpp
• include/network/rpc_client.hpp
• include/network/rpc_server.hpp
• src/catalog/catalog.cpp
• src/distributed/distributed_executor.cpp
• src/distributed/raft_group.cpp
• src/distributed/raft_manager.cpp
• src/executor/query_executor.cpp
• src/main.cpp
• src/network/rpc_client.cpp
• src/network/rpc_server.cpp
• tests/multi_raft_tests.cpp

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch feature/phase-7-replication-ha

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