[third_party] Add mobx, flutter_mobx, mobx_codegen dependencies

This change adds mobx state management library and related packages.
These would be used in flutter app development.

Change-Id: Iac21e2b43dfb1018e481172b4d96267252906c58
Reviewed-on: https://fuchsia-review.googlesource.com/c/topaz/+/518861
Reviewed-by: Chase Latta <chaselatta@google.com>
Commit-Queue: Sanjay Chouksey <sanjayc@google.com>
diff --git a/tools/dart_dependencies.yaml b/tools/dart_dependencies.yaml
index 2e0938d..68b0e03 100644
--- a/tools/dart_dependencies.yaml
+++ b/tools/dart_dependencies.yaml
@@ -12,6 +12,7 @@
   ffi: ^1.0.0
   flutter_image: 3.0.0
   flutter_flux: ^4.1.2
+  flutter_mobx: ^2.0.0
   flutter_staggered_grid_view: ^0.2.2
   flutter_svg: ^0.20.0-nullsafety.3
   googleapis_auth: ^0.2.5+2
@@ -20,6 +21,8 @@
   json_annotation: ^3.1.0
   json_schema: ^1.0.10
   markdown: ^4.0.0
+  mobx: ^2.0.1
+  mobx_codegen: ^2.0.1+3
   mockito: ^5.0.0-nullsafety.5
   protobuf: ^1.0.0
   protoc_plugin: ^19.0.1