metis: implement gRPC daemon server

[YifeiZhuang]

Key changes include:

• Implement standard adaptiveipam gRPC server (daemon_server.go) to listen for pod IP allocation requests over a Unix Domain Socket. And implement rpc AllocatePodIP and DeallocatePodIP.
  • Implemented retries for DB errors within daemon serer.
• Implement new methods in the Store to interface with the SQLite DB, supporting idempotency for all:
  • AddCIDR: Add CIDR blocks and seeds individual IP addresses.
  • AllocateIPv4: Find available IP slots and flips is_allocated to true.
  • ReleaseIPByOwner: Releases pod IP addresses by owner identifiers and sets cooldown period timestamp.

Threading model:

• Each RPC request can call store concurrently to optimize request latency. The DB transactions guarantees thread safet between concurrent requests. Existing WAL mode and busy_timeout supports high concurrent read/write operations without locking.

No implementation for IPv6 yet.

/label tide/merge-method-squash

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[YifeiZhuang]

/test

[YifeiZhuang]

/test all

[YifeiZhuang]

@arvindbr8 @gnossen @zhaoqsh PTAL