Added verify_signature function to kernel

[cowboy0015]

Motivation

Add verifiy_signature function that is used to validate if given message is signed by specified address.

Implementation

• Used secp256k1_verify function to verify that msg was signed by signer_addr
• public_key is used for signature validation
• Throws an InvalidSigner error in case address generated from public_key does not match signer_addr
• address_prefix is currently used for address generating process using public_key

Testing

• Added unit test for verify_signature function

[coderabbitai]

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[joemonem]

Would be nice to have an on-chain test for this

[cowboy0015]

Would be nice to have an on-chain test for this

On chain test was done using separate repo.
https://www.mintscan.io/neutron/tx/9ADD7348FED68373450EC2946F6CCF605C8ECBF22C3E18F35D8369779D57B2C1