tarantool / go-storage / 28269777242

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hasher,crypto: auto/hex/bin encoding modes (v2)

The hasher and crypto constructors take a single encoding Mode via
WithMode(), replacing the earlier hex-by-default / WithRaw() boolean:

- ModeAuto (default): produces raw bytes and, on verification, accepts a
  stored digest/signature in either raw or lower-case hex form. Detection
  is by length (unambiguous: raw is N bytes, hex is 2N), not heuristic.
- ModeHex: produces and accepts only hex.
- ModeBin: produces and accepts only raw bytes.

Because auto writes raw, the default on-disk format is unchanged from v1
while reads tolerate hex, so a store can migrate to hex incrementally.

The Hasher interface gains Verify(data, stored) so the integrity
validator can compare encoding-aware instead of byte-equal; the hash and
signature validator branches are now symmetric. crypto.NewRSAPSS is the
renamed NewRSAPSSSignerVerifier. Docs and fixtures updated; hasher and
crypto are lint-clean and all short tests pass.

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