Improve selective disclosure, add sign callback, several fixes

• Added:

  • Add status object to SelectResults informing the user whether to continue submission to the verifier or not
  • Allow user to pass in ZKP based signature suite types, so that PE can determine whether limited/selective disclosure can be applied. Note you still need to create the proofs yourself
  • Create a Verifiable Presentation with PresentationSubmission object that accepts a signature callback

• Fixed:

  • Ensure supplied params are final and not mutated
  • Limited/selective disclosure fixes