[ marmot-protocol/whitenoise ] Feat/local notifications (#262)

* chore: add flutter local notifications and flutter foreground task deps

* feat: add bridge notifications methods

* feat: add foreground service to keep notifications stream alive

* feat: add notification service and provider

https://github.com/marmot-protocol/whitenoise/commit/027089af5670436839004bf09ed205275390d962