statement-store: Implement explicit affinity

[AndreiEres]

Fixes paritytech/polkadot-sdk#11287

Implements explicit topic affinity for the statement protocol V2 using bloom filters.

• Bloom filter codec with portable cross-platform hashing (wasm32/native)
• V2 wire format: statements (0x00) and affinity (0x01) message types
• Light client sends affinity filter on peer connect and on subscription changes (debounced 1s)
• False positives discarded locally via TopicFilter::matches
• falsePositiveRate and bloomSeed configurable per chain

[socket-security]

Review the following changes in direct dependencies. Learn more about Socket for GitHub.

Diff	Package	Supply Chain Security	Vulnerability	Quality	Maintenance	License
	cargo/​fastbloom@​0.17.0

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