tari-project / tari-crypto / 5185081241

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feat!: expose secret key length as a constant (#181)

Currently, the `PublicKey` trait exposes the encoded key byte length via
the associated `KEY_LEN` constant, and also provides it via the
`key_length` function. However, the `SecretKey` trait only exposes its
encoded key byte length via the `key_length` function, which cannot be
constant. There are use cases where it's handy to get the key size at
compile time, particularly when you want to use arrays and avoid heap
allocations.

This PR unifies the `PublicKey` and `SecretKey` traits by adding an
associated `KEY_LEN` constant to `SecretKey`. It then updates the
`RistrettoSecretKey` implementation accordingly. This retains all
existing functionality, so the change is not breaking.

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