request: prefer_typed_future

[negitorogithub]

Describe the rule you'd like to see implemented
prefer_typed_future is a rule which warns Future without generics.

Examples
This warn
Future result or
Future task(){}.

Future<dynamic> or
Future<void>,
Future<Object?> are allowed.

The motivation is that people should explicit Future<dynamic> when they need.
When you forget to type Future's generics, it will become implicitly Future<dynamic>, which leads to runtime error.(so, this is similar to "implicitly any" in TypeScript)
Therefore, I want this feature to be added.

Additional context
I searched for "future" in Issues, but I wasn't able to find a similar request. Sorry if this feature is duplicated.

[srawlins]

strict-raw-types is an analysis option which will enforce that all of your types are not "raw." I highly recommend it.

[negitorogithub]

@srawlins
Maybe that's I wanted. Thank you❤!