VCs to be associated with Accounts

[techsmyth]

Description

As a user or space admin, I want to be able to create a VC

Acceptance criteria

• [ ] Update VCs to be assocated with Accounts
• [ ] Add mutation to allow the creation of VC on an account, specifying the space to use as body of knowledge
• [ ] Business logic check: only allow selection of Spaces within the Account when creating a VC in an Account.

No option for engine?

TBD: what to do with the VP / VC split?

Additional Context

Keep also the VCs on the platform level at least for now; consider later deleting them and creating from a particular Account.

Areas that will be affected