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>

plugins/database/redshift/redshift-database-plugin/main.go

@@ -0,0 +1,20 @@
+package main
+
+import (
+	"log"
+	"os"
+
+	"github.com/hashicorp/vault/api"
+	"github.com/hashicorp/vault/plugins/database/redshift"
+)
+
+func main() {
+	apiClientMeta := &api.PluginAPIClientMeta{}
+	flags := apiClientMeta.FlagSet()
+	flags.Parse(os.Args[1:])
+
+	if err := redshift.Run(apiClientMeta.GetTLSConfig()); err != nil {
+		log.Println(err)
+		os.Exit(1)
+	}
+}