[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>

vendor/codeberg.org/gruf/go-debug/debug.go

@@ -4,14 +4,9 @@ import (
 	_debug "runtime/debug"
 )
 
-// DEBUG returns whether debugging is enabled.
-func DEBUG() bool {
-	return debug
-}
-
 // Run will only call fn if DEBUG is enabled.
 func Run(fn func()) {
-	if debug {
+	if DEBUG {
 		fn()
 	}
 }