chore(all): provider to servers map in allServers

- Simplify formatting CLI
- Simplify updater code
- Simplify filter choices for config validation
- Simplify all servers deep copying
- Custom JSON marshaling methods for `AllServers`
- Simplify provider constructor switch
- Simplify storage merging
- Simplify storage reading and extraction
- Simplify updating code

internal/updater/loop.go

@@ -139,7 +139,7 @@ func (l *looper) Run(ctx context.Context, done chan<- struct{}) {
 				l.stopped <- struct{}{}
 			case servers := <-serversCh:
 				l.setAllServers(servers)
-				if err := l.flusher.FlushToFile(servers); err != nil {
+				if err := l.flusher.FlushToFile(&servers); err != nil {
 					l.logger.Error(err.Error())
 				}
 				runWg.Wait()