[feature] User muting (#2960)

* User muting

* Address review feedback

* Rename uniqueness constraint on user_mutes to match convention

* Remove unused account_id from where clause

* Add UserMute to NewTestDB

* Update test/envparsing.sh with new and fixed cache stuff

* Address tobi's review comments

* Make compiledUserMuteListEntry.expired consistent with UserMute.Expired

* Make sure mute_expires_at is serialized as an explicit null for indefinite mutes

---------

Co-authored-by: tobi <tobi.smethurst@protonmail.com>

internal/typeutils/converter.go

@@ -20,6 +20,7 @@ package typeutils
 import (
 	"sync"
 
+	"github.com/superseriousbusiness/gotosocial/internal/filter/visibility"
 	"github.com/superseriousbusiness/gotosocial/internal/state"
 )
 
@@ -27,11 +28,13 @@ type Converter struct {
 	state          *state.State
 	defaultAvatars []string
 	randAvatars    sync.Map
+	filter         *visibility.Filter
 }
 
 func NewConverter(state *state.State) *Converter {
 	return &Converter{
 		state:          state,
 		defaultAvatars: populateDefaultAvatars(),
+		filter:         visibility.NewFilter(state),
 	}
 }