feat: add GetFingerprints & GetJsonFingerprints for primary and sub keys #345
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GetFingerprints() []string
Returns SHA-1 fingerprints of primary key and all subkeys.
GetJsonFingerprints() (string, error)
Same data, JSON-encoded for gomobile bind where slice-of-string
is not always stable across language bindings.
This allows apps to list every fingerprint including subkeys
without re-implementing the walk logic outside the library.
Unit test included (crypto/key_test.go).