Add redshift database plugin (#8299)

* feat: add redshift database plugin

* build: update vendored libraries

* docs: add reference doc for redshift variant of the database secrets engine

* feat: set middlewear type name for better metrics naming (#8346)

Co-authored-by: Becca Petrin <beccapetrin@gmail.com>

command/base_predict_test.go

@@ -386,6 +386,7 @@ func TestPredict_Plugins(t *testing.T) {
 				"postgresql-database-plugin",
 				"rabbitmq",
 				"radius",
+				"redshift-database-plugin",
 				"ssh",
 				"totp",
 				"transit",