chore: Refactor Enterprise code to layer on top of AGPL (#4034)

* chore: Refactor Enterprise code to layer on top of AGPL

This is an experiment to invert the import order of the Enterprise
code to layer on top of AGPL.

* Fix Garrett's comments

* Add pointer.Handle to atomically obtain references

This uses a context to ensure the same value persists through
multiple executions to `Load()`.

* Remove entitlements API from AGPL coderd

* Remove AGPL Coder entitlements endpoint test

* Fix warnings output

* Add command-line flag to toggle audit logging

* Fix hasLicense being set

* Remove features interface

* Fix audit logging default

* Add bash as a dependency

* Add comment

* Add tests for resync and pubsub, and add back previous exp backoff retry

* Separate authz code again

* Add pointer loading example from comment

* Fix duplicate test, remove pointer.Handle

* Fix expired license

* Add entitlements struct

* Fix context passing

cli/root.go

@@ -91,12 +91,13 @@ func Core() []*cobra.Command {
 		users(),
 		versionCmd(),
 		workspaceAgent(),
-		features(),
 	}
 }
 
 func AGPL() []*cobra.Command {
-	all := append(Core(), Server(coderd.New))
+	all := append(Core(), Server(func(_ context.Context, o *coderd.Options) (*coderd.API, error) {
+		return coderd.New(o), nil
+	}))
 	return all
 }
 
@@ -548,13 +549,11 @@ func checkWarnings(cmd *cobra.Command, client *codersdk.Client) error {
 	defer cancel()
 
 	entitlements, err := client.Entitlements(ctx)
-	if err != nil {
-		return xerrors.Errorf("get entitlements to show warnings: %w", err)
+	if err == nil {
+		for _, w := range entitlements.Warnings {
+			_, _ = fmt.Fprintln(cmd.ErrOrStderr(), cliui.Styles.Warn.Render(w))
+		}
 	}
-	for _, w := range entitlements.Warnings {
-		_, _ = fmt.Fprintln(cmd.ErrOrStderr(), cliui.Styles.Warn.Render(w))
-	}
-
 	return nil
 }