[REQUEST] Add a guilds property to Client

[Jalancar]

Describe the feature.

There needs to be an easier way to access the guilds that the bot is in, especially in a task loop. I would like a guilds property added to the Client class that would have return all of the bot's guilds.

Code of Conduct

• I agree to follow the contribution requirements.

[FayeDel]

Closing issue as the associated PR has been merged to unstable.