Basic support for object flags

[beeme1mr]

Add support for basic object flags in all the existing generators. The return types should match what's defined in the OpenFeature SDKs.

Requirements

• All generators support object flags
• E2E tests are updated
• UnsupportedFlagTypes is updated or removed from the generator
• Docs are regenerated make generate-doc

Out of scope

Validation and additional type-safety will be addressed in a follow-up issue.

[bbland1]

Can I be assigned to this? I’d like to work this!