[Proposal] Target typed generic type parameter

[hillin]

This is kind of a generalization of target typed new.
If a generic method takes exactly one generic parameter, and returns a value of that type, the generic parameter could be omitted.

Example:

public MyService MyService => Inject<MyService>();
// and a whole lot of other injections

private T Inject<T>() => ServiceProvider.GetRequiredService<T>();

could benefit from this feature:

public MyService MyService => Inject();
// and a whole lot of other injections

private T Inject<T>() => ServiceProvider.GetRequiredService();

[HaloFour]

See: #92