Fix W3cCredentialsApi verifyCredential types

[jrhender]

I believe the type signature of the W3cCredentialsApi verifyCredential method is incorrect.

Code as follows has a TS compilation error:

const w3cVerifyCredentialOptions: W3cVerifyCredentialOptions<ClaimFormat.LdpVc> = {
      credential: W3cJsonLdVerifiableCredential.fromJson(vc)
};
const verifyCredential: W3cVerifyCredentialResult =
      await this.credoService.agent.w3cCredentials.verifyCredential(w3cVerifyCredentialOptions);

Argument of type 'W3cJsonLdVerifyCredentialOptions' is not assignable to parameter of type 'W3cJwtVerifyCredentialOptions'.
  Types of property 'credential' are incompatible.
    Type 'W3cJsonLdVerifiableCredential' is not assignable to type 'string | W3cJwtVerifiableCredential'.
      Type 'W3cJsonLdVerifiableCredential' is missing the following properties from type 'W3cJwtVerifiableCredential': jwt, _credential, credential, serializedJwtts(2345)

I suggest that the type signature of verifyCredential be changed from

public async verifyCredential(options: W3cVerifyCredentialOptions)

to

public async verifyCredential<Format extends ClaimFormat.JwtVc | ClaimFormat.LdpVc>(options: W3cVerifyCredentialOptions<Format>