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feat(raft): Implement Raft-based Consistent Hash State Management (#636)

* feat: Add Raft consensus for consistent hashing

This commit introduces Raft consensus to maintain consistency of hash-to-proxy
mappings across multiple GatewayD instances. Key changes include:

- Add new Raft package implementing consensus protocol using HashiCorp's Raft
- Integrate Raft with consistent hashing load balancer
- Store proxy mappings in distributed state machine
- Add configuration options for Raft cluster setup
- Implement leadership monitoring and peer management
- Add FSM snapshot and restore capabilities

The implementation ensures that hash-to-proxy mappings remain consistent across
cluster nodes, improving reliability for consistent hash-based load balancing.

* refactor: update consistent hash implementation with block-based proxy mapping

- Replace proxy ID with block name for consistent hash mapping
- Remove direct raft node dependency from ConsistentHash struct
- Add ProxyByBlock map to Server for block-based proxy lookups
- Include group name in hash key generation for better distribution
- Add proxy initialization during server startup
- Update FSM to use consistent naming for hash map storage

This change improves the consistent hashing mechanism by using block names
instead of proxy IDs, making it more aligned with the block-based
architecture while maintaining backwards compatibility with the original
load balancing strategy.

* refactor: remove proxy ID and related functionality

- Remove unused UUID-based ID field from Proxy struct
- Remove GetID() method from IProxy interface and Proxy implementation
- Remove GetProxyByID() method from Server struct
- Remove uuid package dependency

The proxy ID was not being used meaningfully in the codebase, so removing it
simplifies the proxy implementation.

* feat(raft): Add Raft integration tests and consistent hash improvements

This commit introduces comprehensive Raft testing infrastructure and enhance... (continued)

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