Add ability to set approval-based registration through tootctl (#18248)
Add ability to set approval-based registration through tootctl (#18248)

Fixes #18235

Add `tootctl settings registrations approved` with
optional `--require-reason` switch.
koba-lab/mastodon,koba-lab/mastodon,im-in-space/mastodon,im-in-space/mastodon,musashino205/mastodon,maa123/mastodon,tootcafe/mastodon,imas/mastodon,cobodo/mastodon,theoria24/mastodon,yukimochi/mastodon,gol-cha/mastodon,tootcafe/mastodon,koba-lab/mastodon,Ryanaka/mastodon,glitch-soc/mastodon,im-in-space/mastodon,theoria24/mastodon,h3zjp/mastodon,musashino205/mastodon,MitarashiDango/mastodon,pinfort/mastodon,tootcafe/mastodon,MitarashiDango/mastodon,glitch-soc/mastodon,h3zjp/mastodon,MitarashiDango/mastodon,im-in-space/mastodon,Ryanaka/mastodon,imas/mastodon,Ryanaka/mastodon,ykzts/mastodon,theoria24/mastodon,theoria24/mastodon,koba-lab/mastodon,musashino205/mastodon,yukimochi/mastodon,masto-donte-com-br/mastodon,pinfort/mastodon,maa123/mastodon,masto-donte-com-br/mastodon,cobodo/mastodon,musashino205/mastodon,ykzts/mastodon,h3zjp/mastodon,gol-cha/mastodon,glitch-soc/mastodon,imas/mastodon,maa123/mastodon,cobodo/mastodon,maa123/mastodon,cobodo/mastodon,glitch-soc/mastodon,pinfort/mastodon,ykzts/mastodon,h3zjp/mastodon,pinfort/mastodon,tootcafe/mastodon,Ryanaka/mastodon,masto-donte-com-br/mastodon,MitarashiDango/mastodon,imas/mastodon,masto-donte-com-br/mastodon,gol-cha/mastodon,yukimochi/mastodon,yukimochi/mastodon,ykzts/mastodon,gol-cha/mastodon