[federated_plugin] adds web implementation of federated_plugin (#507)

experimental/federated_plugin/federated_plugin/example/pubspec.lock

@@ -7,7 +7,7 @@ packages:
       name: async
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "2.4.2"
+    version: "2.4.1"
   boolean_selector:
     dependency: transitive
     description:
@@ -15,13 +15,6 @@ packages:
       url: "https://pub.dartlang.org"
     source: hosted
     version: "2.0.0"
-  characters:
-    dependency: transitive
-    description:
-      name: characters
-      url: "https://pub.dartlang.org"
-    source: hosted
-    version: "1.1.0-nullsafety"
   charcode:
     dependency: transitive
     description:
@@ -42,7 +35,7 @@ packages:
       name: collection
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "1.15.0-nullsafety"
+    version: "1.14.12"
   cupertino_icons:
     dependency: "direct main"
     description:
@@ -71,6 +64,13 @@ packages:
       relative: true
     source: path
     version: "0.0.1"
+  federated_plugin_web:
+    dependency: transitive
+    description:
+      path: "../../federated_plugin_web"
+      relative: true
+    source: path
+    version: "0.0.1"
   flutter:
     dependency: "direct main"
     description: flutter
@@ -81,20 +81,25 @@ packages:
     description: flutter
     source: sdk
     version: "0.0.0"
+  flutter_web_plugins:
+    dependency: transitive
+    description: flutter
+    source: sdk
+    version: "0.0.0"
   matcher:
     dependency: transitive
     description:
       name: matcher
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "0.12.8"
+    version: "0.12.6"
   meta:
     dependency: transitive
     description:
       name: meta
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "1.3.0-nullsafety"
+    version: "1.1.8"
   path:
     dependency: transitive
     description:
@@ -108,7 +113,7 @@ packages:
       name: pedantic
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "1.9.2"
+    version: "1.9.0"
   plugin_platform_interface:
     dependency: transitive
     description:
@@ -134,7 +139,7 @@ packages:
       name: stack_trace
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "1.9.5"
+    version: "1.9.3"
   stream_channel:
     dependency: transitive
     description:
@@ -162,21 +167,21 @@ packages:
       name: test_api
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "0.2.17"
+    version: "0.2.16"
   typed_data:
     dependency: transitive
     description:
       name: typed_data
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "1.3.0-nullsafety"
+    version: "1.1.6"
   vector_math:
     dependency: transitive
     description:
       name: vector_math
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "2.1.0-nullsafety"
+    version: "2.0.8"
 sdks:
-  dart: ">=2.9.0-18.0 <2.9.0"
+  dart: ">=2.7.0 <3.0.0"
   flutter: ">=1.17.0 <2.0.0"