Add 'Main' and 'Recent' option to settings in Feed Fidget for Channels

[willyogo]

As a user, I want to be able to configure a feed fidget for a channel to have Main and Recent tabs like warpcast.

Implementation: should_moderate = true https://docs.neynar.com/reference/feed-channels

AC:

1. A new checkbox setting is added to the Feed Fidget when Channel Filtering is selected: Split feed into Main and Recent tabs
2. If a user checks the box, the feed displays the channel feed with should_moderate = true for Main and should_moderate = false for Recent