check credential preview attributes against schema attributes before making credential offer

[TimoGlastra]

When issuing a credential for a schema/credential definition with attribute names that do not match the schema, a vague CommonInvalidStructure error will be thrown when issuing the credential.

We should add a check when offering a credential (CredentialService.createOffer and CredentialService.createOfferAsResponse) to make sure the attributes from the preview match the attributes from the schema.

Implementation in ACA-Py: https://github.com/hyperledger/aries-cloudagent-python/blob/cd5588f79beb7314f03d78bdfb979d1d6b99acd8/aries_cloudagent/protocols/issue_credential/v1_0/manager.py#L274-L283

ERROR [undefined.<anonymous>] Error processing inbound message: IndyError(CommonInvalidStructure): CommonInvalidStructure 
IndySdkError: IndyError(CommonInvalidStructure): CommonInvalidStructure
    at IndyIssuerService.createCredential (/Users/annelein/Animo/afj-demo/demo/node_modules/@aries-framework/core/src/modules/indy/services/IndyIssuerService.ts:127:15)
    at async CredentialService.createCredential (/Users/annelein/Animo/afj-demo/demo/node_modules/@aries-framework/core/src/modules/credentials/services/CredentialService.ts:571:26)
    at async RequestCredentialHandler.createCredential (/Users/annelein/Animo/afj-demo/demo/node_modules/@aries-framework/core/src/modules/credentials/handlers/RequestCredentialHandler.ts:41:43)
    at async RequestCredentialHandler.handle (/Users/annelein/Animo/afj-demo/demo/node_modules/@aries-framework/core/src/modules/credentials/handlers/RequestCredentialHandler.ts:29:14)
    at async Dispatcher.dispatch (/Users/annelein/Animo/afj-demo/demo/node_modules/@aries-framework/core/src/agent/Dispatcher.ts:47:25)
    at async MessageReceiver.receiveEncryptedMessage (/Users/annelein/Animo/afj-demo/demo/node_modules/@aries-framework/core/src/agent/MessageReceiver.ts:134:5)
    at async MessageReceiver.receiveMessage (/Users/annelein/Animo/afj-demo/demo/node_modules/@aries-framework/core/src/agent/MessageReceiver.ts:73:7)
    at async Agent.receiveMessage (/Users/annelein/Animo/afj-demo/demo/node_modules/@aries-framework/core/src/agent/Agent.ts:208:12)
    at async /Users/annelein/Animo/afj-demo/demo/node_modules/@aries-framework/node/src/transport/HttpInboundTransport.ts:44:9 {
  cause: IndyError: CommonInvalidStructure
      at Object.callback (/Users/annelein/Animo/afj-demo/node_modules/indy-sdk/src/wrapIndyCallback.js:15:10) {
    indyCode: 113,
    indyName: 'CommonInvalidStructure',
    indyCurrentErrorJson: null
  }
}