Add BlockStorage and StateStorage to local adapter with tests
Implement full local storage adapter with three interfaces:
- Provider: Basic object storage (Put, Get, Delete, Exists, List, Head)
- BlockStorage: Block-indexed storage (PutBlock, GetBlock, GetBlockRange)
- StateStorage: State snapshot storage (PutState, GetState, GetLatestState)
Implementation details:
- Content-addressed storage using SHA256 for object IDs
- Directory sharding for filesystem performance:
- Objects: first 2 chars of hash (e.g., objects/91/91f0...)
- Blocks: every 10,000 (e.g., blocks/0001/12345.block)
- States: every 10,000 (e.g., states/0001/12345.state)
- Metadata JSON sidecar files with content type and attributes
- Thread-safe with sync.RWMutex
- Size quota enforcement across all directories
Test coverage (30 tests):
- Provider interface: Put/Get, Delete, Exists, Head, List, quota
- BlockStorage: PutGetBlock, GetBlockRange, GetLatestBlockIndex
- StateStorage: PutGetState, GetLatestState, quota enforcement
- Path helpers and interface compliance verification
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Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
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