extend Enum api

[Borda]

🚀 Feature

it may be nice to have some general calls over our enums such as Distributed mentioned by @carmocca in #5300 (comment)

Any logic to compare different DistributedTypes should be encapsulated by the enum itself.

• PoC: Accelerator refactor #5743 (comment)
• PoC: Accelerator refactor #5743 (comment)
• Ensure accelerator is valid if running interactively #5970 (comment)

Motivation

easier handling some cumulative behaviours, such is_ddp which cover DDP and DDP_SPAWN

Pitch

class DistributedType(LightningEnum):
    DP = 'dp'
    ...

    def is_distributed(self):
        return self in (DistributedType.DDP, DistributedType.DDP_SPAWN, DistributedType.DDP2)