Worker Domain Refactor (#5338)

* feat(server): Refactor LookupWorkerByName to be a test method

* feat(server): Split worker tags table

* refact(worker): Export api and config tags

* refact(server): Return worker id from UpsertWorkerStatus

* refact(server): Create ListWorkerStorageBucketUpdates domain function

* refact(server): Use dedicated HCPb-worker list func

* refact(server): Create ConnectionRoute domain function

* refact(handlers): Move worker selection logic to internal/server package

This commit moves all the logic to select a worker to handle a session
to the internal/server package. Most functions were moved to this
package with no changes, however, there are a couple of notable
exceptions:

- Given that we don't use GRPC errors in repos, all errors were adjusted
  to use the internal/errors package instead.
- StorageBucketFilterCredIdFn is now used to prevent the internal/server
  package from importing internal/storage/plugin, which would cause a
  dep cycle. Callers of SelectSessionWorkers must implement this func
  which is responsible for returning a storage bucket's worker filter as
  well as its associated credential id.
- authorizeSessionWithWorkerFilter now receives an
  internal/server.(*Repository) object when called. This is transparent
  to SelectSessionWorkers callers as it is handled internally.

* feat(server): Add FilteredWithFeatures fn and new server options

* refact(server): create new list and lookup worker queries

* test(server): Add WorkerList unit tests

* feat(server): Implement WorkerList randomness using crypto/rand pkg

* chore(db): add index to server_worker table

* refact(server): prefix test method with Test

* refact(server): rename Downstreamers interface to Graph

* chore(server): unexport and rename method

* chore: add doc string to WorkerAddress (#5420)

---------

Co-authored-by: Irena Rindos <irenarindos@users.noreply.github.com>
Co-authored-by: irenarindos <irena.rindos@gmail.com>

internal/daemon/controller/controller.go

@@ -27,6 +27,7 @@ import (
 	"github.com/hashicorp/boundary/internal/credential/vault"
 	"github.com/hashicorp/boundary/internal/daemon/cluster"
 	"github.com/hashicorp/boundary/internal/daemon/controller/common"
+	"github.com/hashicorp/boundary/internal/daemon/controller/downstream"
 	"github.com/hashicorp/boundary/internal/daemon/controller/handlers/health"
 	"github.com/hashicorp/boundary/internal/daemon/controller/internal/metric"
 	"github.com/hashicorp/boundary/internal/db"
@@ -89,8 +90,8 @@ type downstreamWorkersTicker interface {
 var (
 	downstreamReceiverFactory func(*atomic.Int64) (downstreamReceiver, error)
 
-	downstreamersFactory           func(context.Context, string, string) (common.Downstreamers, error)
-	downstreamWorkersTickerFactory func(context.Context, string, string, common.Downstreamers, downstreamReceiver, *atomic.Int64) (downstreamWorkersTicker, error)
+	graphFactory                   func(context.Context, string, string) (downstream.Graph, error)
+	downstreamWorkersTickerFactory func(context.Context, string, string, downstream.Graph, downstreamReceiver, *atomic.Int64) (downstreamWorkersTicker, error)
 	commandClientFactory           func(context.Context, *Controller) error
 	extControllerFactory           func(ctx context.Context, c *Controller, r db.Reader, w db.Writer, kms *kms.Kms) (intglobals.ControllerExtension, error)
 )
@@ -109,7 +110,7 @@ type Controller struct {
 	workerAuthCache *sync.Map
 
 	// downstream workers and routes to those workers
-	downstreamWorkers common.Downstreamers
+	downstreamWorkers downstream.Graph
 	downstreamConns   downstreamReceiver
 
 	apiListeners    []*base.ServerListener
@@ -494,9 +495,9 @@ func New(ctx context.Context, conf *Config) (*Controller, error) {
 		event.WriteSysEvent(ctx, op, "unable to ensure worker auth roots exist, may be due to multiple controllers starting at once, continuing")
 	}
 
-	if downstreamersFactory != nil {
+	if graphFactory != nil {
 		boundVer := version.Get().VersionNumber()
-		c.downstreamWorkers, err = downstreamersFactory(ctx, "root", boundVer)
+		c.downstreamWorkers, err = graphFactory(ctx, "root", boundVer)
 		if err != nil {
 			return nil, fmt.Errorf("unable to initialize downstream workers graph: %w", err)
 		}