Publish SPM products for RC and DB (#6105)

Author: paulb777

Package.swift

@@ -43,6 +43,10 @@ let package = Package(
       name: "FirebaseCrashlytics",
       targets: ["FirebaseCrashlytics"]
     ),
+    .library(
+      name: "FirebaseDatabase",
+      targets: ["FirebaseDatabase"]
+    ),
     .library(
       name: "FirebaseFunctions",
       targets: ["FirebaseFunctions"]
@@ -55,6 +59,10 @@ let package = Package(
     //   name: "FirebaseInstanceID",
     //   targets: ["FirebaseInstanceID"]
     // ),
+    .library(
+      name: "FirebaseRemoteConfig",
+      targets: ["FirebaseRemoteConfig"]
+    ),
     .library(
       name: "FirebaseStorage",
       targets: ["FirebaseStorage"]