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Add optional Credential_Manifest method to CAIP-169 #195

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To allow more complex issuance.

Also rearranges methods to be more readable (and move all optional methods to the end)

use-case, but in either case MUST be formated as a valid
[credential_application object][] as specified in the [Credential Manifest][]
specification.
- `preferred_proofs` - OPTIONAL. An **ordered** array (from most to least

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[Note: this is hard to review -- I can't figure out what's going on with the diffs. Visually it looks like there's no difference between store and verify, but they are getting pulled in. I tried messing with whitespace settings but no dice.]

I think there may be collision with this and credential application's format property:

The object MUST have a format property if the related [Credential Manifest](https://identity.foundation/credential-manifest/#term:credential-manifest) specifies a format property. Its value MUST be a subset of the format property in the [Credential Manifest](https://identity.foundation/credential-manifest/#term:credential-manifest) that this [Credential Submission](https://identity.foundation/credential-manifest/#term:credential-submission) is related to. This object informs the [Issuer](https://identity.foundation/credential-manifest/#term:issuer) which formats the [Holder](https://identity.foundation/credential-manifest/#term:holder) wants to receive the [Claims](https://identity.foundation/credential-manifest/#term:claims) in.

It looks like this spec is assuming the presence of a credential manifest, I think it shouldn't need preferred_proofs.

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Agreed -- I think that was an OIDC interop thing, like the wallet metadata getter.

@awoie would it make sense to warn readers of the spec that preferred_proofs is ONLY required for OIDC backwards compat and that the preferred way of communicating this is in the
formats property of the credential_application?

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(review most recent commit-- i may be confused about what the use-case for this redundant/fallback object is, let me know if i am!)

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Can you describe a typical flow how a developer could use that for issuance and presentation of credentials?

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