crypto: ser/de update and use nonrecoverable sig for secp256k1/r1

[joyqvq]

What Changed

• For CLI and SDK, a ECDSA k1 and r1 signature is produced using the nonrecoverable form. This means the signature is 64 bytes instead of 65.
• The signature verification in sui also uses the nonrecoverable option. A valid signature should have 64 bytes.
• Also exposes secp256k1_verify and secp256k1_verify_recoverable API in move.
• Ser/de of public keys and signatures now uses the most compact serialization with ToFromBytes.

What Do You Need To Do

• If you are using SDK to produce a Secp256k1 signature, no change is needed.
• If you are using something else to produce a signature, your old signature will not be considered valid.You should just need to remove the last byte to make it a valid signature.

Next:

• r1 verify and verify_recoverable added in https://github.com/MystenLabs/sui/pull/7773

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[jonas-lj]

Looks good to me!