feat: Add external provisioner daemons (#4935)

* Start to port over provisioner daemons PR

* Move to Enterprise

* Begin adding tests for external registration

* Move provisioner daemons query to enterprise

* Move around provisioner daemons schema

* Add tags to provisioner daemons

* make gen

* Add user local provisioner daemons

* Add provisioner daemons

* Add feature for external daemons

* Add command to start a provisioner daemon

* Add provisioner tags to template push and create

* Rename migration files

* Fix tests

* Fix entitlements test

* PR comments

* Update migration

* Fix FE types

coderd/database/dbtype/dbtype.go

@@ -0,0 +1,30 @@
+package dbtype
+
+import (
+	"database/sql/driver"
+	"encoding/json"
+
+	"golang.org/x/xerrors"
+)
+
+type StringMap map[string]string
+
+func (m *StringMap) Scan(src interface{}) error {
+	if src == nil {
+		return nil
+	}
+	switch src := src.(type) {
+	case []byte:
+		err := json.Unmarshal(src, m)
+		if err != nil {
+			return err
+		}
+	default:
+		return xerrors.Errorf("unsupported Scan, storing driver.Value type %T into type %T", src, m)
+	}
+	return nil
+}
+
+func (m StringMap) Value() (driver.Value, error) {
+	return json.Marshal(m)
+}