[feature] Importing mute lists

[JacksonChen666]

Is your feature request related to a problem ?

I'm looking to migrate (ok, not immediately) to GoToSocial. Possibly from another GoToSocial instance where I can export my mutes list! But I can't import them in GoToSocial.

Describe the solution you'd like.

Ability to import mute lists in the import/export section of settings

Describe alternatives you've considered.

None

Additional context.

No response