[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/pprof_on.go

@@ -11,7 +11,7 @@ import (
 
 // ServePprof will start an HTTP server serving /debug/pprof only if debug enabled.
 func ServePprof(addr string) error {
-	if !debug {
+	if !DEBUG {
 		// debug disabled in env
 		return nil
 	}
@@ -21,7 +21,7 @@ func ServePprof(addr string) error {
 
 // WithPprof will add /debug/pprof handling (provided by "net/http/pprof") only if debug enabled.
 func WithPprof(handler http.Handler) http.Handler {
-	if !debug {
+	if !DEBUG {
 		// debug disabled in env
 		return handler
 	}