[performance] processing media and scheduled jobs improvements (#1482)

* replace media workers with just runners.WorkerPool, move to state structure, use go-sched for global task scheduling

* improved code comment

* fix worker tryUntil function, update go-runners/go-sched

* make preprocess functions package public, use these where possible to stop doubled up processing

* remove separate emoji worker pool

* limit calls to time.Now() during media preprocessing

* use Processor{} to manage singular runtime of processing media

* ensure workers get started when media manager is used

* improved error setting in processing media, fix media test

* port changes from processingmedia to processing emoji

* finish code commenting

* finish code commenting and comment-out client API + federator worker pools until concurrency worker pools replaced

* linterrrrrrrrrrrrrrrr

---------

Signed-off-by: kim <grufwub@gmail.com>

testrig/mediahandler.go

@@ -21,14 +21,15 @@ package testrig
 import (
 	"github.com/superseriousbusiness/gotosocial/internal/db"
 	"github.com/superseriousbusiness/gotosocial/internal/media"
+	"github.com/superseriousbusiness/gotosocial/internal/state"
 	"github.com/superseriousbusiness/gotosocial/internal/storage"
 )
 
 // NewTestMediaManager returns a media handler with the default test config, and the given db and storage.
 func NewTestMediaManager(db db.DB, storage *storage.Driver) media.Manager {
-	m, err := media.NewManager(db, storage)
-	if err != nil {
-		panic(err)
-	}
-	return m
+	var state state.State
+	state.DB = db
+	state.Storage = storage
+	state.Workers.Start()
+	return media.NewManager(&state)
 }