Introduction of PresentationParserChain and PublicKeyResolverChain to increase flexibility

[kkmanos]

The VerifierConfigurationService dependency on src/configuration/verifier/VerifierConfigurationService.ts now implements new functions of the VerifierConfigurationInterface interface.

getPresentationParserChain(): This function is called in the presentation flow when parsing the contents of the credentials. The VerifierConfigurationService can be configured to add additional parsers aside from the sdJwtDefaultParser which is already part of the parsers chain. An additional parser can be added by calling addParser(.) on the returned PresentationParserChain object.

getPublicKeyResolverChain(): This function is called in the presentation flow when verifying the verifiable presentations. It is designed to give the ability to extend the public key resolver chain with other methods of public key resolution. An additional public key resolver can be added by calling addResolver(.) on the returned PublicKeyResolverChain object.

The last defined presentation parser is called first. Similarly for the public key resolvers.