[feature] List replies policy, refactor async workers (#2087)

* Add/update some DB functions.

* move async workers into subprocessor

* rename FromFederator -> FromFediAPI

* update home timeline check to include check for current status first before moving to parent status

* change streamMap to pointer to mollify linter

* update followtoas func signature

* fix merge

* remove errant debug log

* don't use separate errs.Combine() check to wrap errs

* wrap parts of workers functionality in sub-structs

* populate report using new db funcs

* embed federator (tiny bit tidier)

* flesh out error msg, add continue(!)

* fix other error messages to be more specific

* better, nicer

* give parseURI util function a bit more util

* missing headers

* use pointers for subprocessors

internal/workers/workers.go

@@ -43,7 +43,7 @@ type Workers struct {
 	// these are pointers to Processor{}.Enqueue___() msg functions.
 	// This prevents dependency cycling as Processor depends on Workers.
 	EnqueueClientAPI func(context.Context, ...messages.FromClientAPI)
-	EnqueueFederator func(context.Context, ...messages.FromFederator)
+	EnqueueFediAPI   func(context.Context, ...messages.FromFediAPI)
 
 	// Media manager worker pools.
 	Media runners.WorkerPool