Embed: refactor identity package

[nutrina]

The identity package in the passport repo handles:

• issuing of VCs - this is a backend functionality, that is used in the IAM
• fetching VCs - this functionality is used in the app, and it basically performs an http reuqest with axios to claim VCs from the iam

The fact that we have functionality for the app in there makes it hard to extend this module with additional features that are related to validation / issuance of stamps in backend services.

Tasks

• move all app related functionality (fetchVerifiableCredential and its helpers) into the app. This means the identity module will only be used in the backend.
• consolidate stamp verification and issuance into the identity module:
  • this means code that was performing validating of stamps in iam and embed should be consolidate (remove redundancies) and moved here
• update implementation in iam to use the new functionality in the identity module
• update implementation in embed to use the new functionality in the identity module

Ideally the package dependencies should look like:

flowchart TD
    A[Iam] -->|stamp verification/issuance| I[identity]
    E[embed] -->|stamp verification/issuance| I
    I -->|stamp providers| P[Platforms]
    U[app] -->|stamp & provider declaration & metadata| P
    U -->|ceramic| F[database-client]
    U -->|type definitions| T[types]
    A -->|type definitions| T
    E -->|type definitions| T
    P -->|type definitions| T
    I -->|type definitions| T

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