[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/cache/cache.go

@@ -94,6 +94,8 @@ func (c *Caches) Init() {
 	c.initToken()
 	c.initTombstone()
 	c.initUser()
+	c.initUserMute()
+	c.initUserMuteIDs()
 	c.initWebfinger()
 	c.initVisibility()
 }
@@ -164,5 +166,7 @@ func (c *Caches) Sweep(threshold float64) {
 	c.GTS.Token.Trim(threshold)
 	c.GTS.Tombstone.Trim(threshold)
 	c.GTS.User.Trim(threshold)
+	c.GTS.UserMute.Trim(threshold)
+	c.GTS.UserMuteIDs.Trim(threshold)
 	c.Visibility.Trim(threshold)
 }