[feat] Single signer verification functions for multisig

[3ierratango]

Changelog:

• Add new verification functions that does not check for quorum signatures

[naiemk]

Instead of creating a new verify method break the tryVerifyDigestWithAddress‍‍ method into two:

• tryVerifyDigestWithAddress
• tryVerifyDigestWithAddressNoMinSigCheck

tryVerifyDigestWithAddress will call the NoMinSigcheck and after check the following:

require(
            signatures.length >= q.minSignatures,
            "MSC: not enough signatures"
        );

tryVerifyDigestWithAddressNoMinSigCheck is only renamed from tryVerifyDigestWithAddress with above lines removed

[naiemk]

Closing in the favor of this PR: #10

I made some changes. First, kept the library API unchanged. There are some other contracts using this lib. Second, removed the signle signer check method because it is not really checking for single signer, it is checking for multi-signer without count validation