perf(fmt): optimize cache serialization - #341
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Summary
rs fmtcurrently repeats object keys, option hashes, state strings, and full SHA-256 digests for every cached file, increasing cache I/O and JSON overhead in large repositories.This PR introduces a version 2 flat cache format with interned option hashes, numeric states, and 96-bit base64url SHA-256 tokens while retaining top-level schema checks and atomic persistence.
In an rsbuild repository benchmark, cache size decreased by 62% and JSON parse/stringify time by about 60%.