feat: add Status field to Issuance's Offer and Credential aggregates

[nanderstabel]

Description of change

As title.

Also this PR introduces some slight refactor:
For both the Offer and Credential aggregates the corresponding OfferView and CredentialView are moved from the queries folder to the new views folder.

Blocked by

• feat: add support for linked verifiable presentations #92
• feat: query aggregate instances by id #130
• feat: bootstrap identity Connection aggregate #131

Links to any relevant issues

• Add status field to Credential and Offer aggregates in agent_issuance #119

How the change has been tested

Updated existing unit tests

Definition of Done checklist

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