Remove ProofProtocolVersion enum in 0.3.0-pre

[TimoGlastra]

As they are now dynamically registered, an enum doesn't work. This is also needed to make the credentials and proofs API consistent.

[TimoGlastra]

@NB-MikeRichardson is this something you can pick up as well?

[NB-MikeRichardson]

Sure. I can do that today.

I assume we just want to replace the enum with a string?? (which I think is what we do in the credentials module)

[TimoGlastra]

For the records, yes it can be a string. For other places it sometimes should be a dynamic type (but I think you already added that in the proofs api when you updated it to align with the credentials api).

We have the ProtocolVersionType in the ProofsApiOptions

[TimoGlastra]

Also, I just noticed the requestProof method doesn't specify the proof services, and proof formats, which removes the type hinting. Can you add it with the PR?

In ProofsApi.ts:

public async requestProof(options: RequestProofOptions<PFs, PSs>): Promise<ProofRecord> {

[NB-MikeRichardson]

On it

[NB-MikeRichardson]

Looks like the same issue with proposeProof as well. Will fix this too.