toasterTypes: change toaster to ref

Instead of rendering the toaster separate from the main index, add it
there so we can inherit all of the context providers. This requires
passing the ref object instead of the toaster instance itself, so
sagas have to be updated.

src/sagas.ts

@@ -16,7 +16,7 @@ import hub from './hub/sagas';
 import lwp3BootloaderProtocol from './lwp3-bootloader/sagas';
 import lwp3BootloaderBle from './lwp3-bootloader/sagas-ble';
 import mpy from './mpy/sagas';
-import notifications, { NotificationSagaContext } from './notifications/sagas';
+import notifications from './notifications/sagas';
 import terminal, { TerminalSagaContext } from './terminal/sagas';
 
 /* istanbul ignore next */
@@ -48,5 +48,4 @@ export type RootSagaContext = {
     nextMessageId: () => number;
 } & AlertsSagaContext &
     FileStorageSageContext &
-    NotificationSagaContext &
     TerminalSagaContext;