[frontend/backend] Added persona/moniker support

[Bonsai8863]

Proposed changes

• Added a "Persona" SCO defined with a name and persona_type open vocabulary.
• Added a SRO "known as" for TA Individuals to other TA Individuals or Personas.
• Added integration tests for GraphQL new stixCyberObservable persona resolver.

To-Do

• [x] Specific frontend support of persona/moniker display in TA Individual overview.
• [ ] Add Playwright tests for UI changes.
• [ ] ref_to_rel (i.e. use_moniker_ref) to model actions done by monikers.
• [ ] Potentially add more keys, e.g. platform account id, platform name, etc. to Persona SCO.

Checklist

• [x] I consider the submitted work as finished
• [x] I wrote integration test cases for the GraphQL resolvers
• [ ] I wrote user interface tests
• [ ] I added/update the relevant documentation (either on github or on notion)
• [ ] Where necessary I refactored code to improve the overall quality