Add `limitN` functions to wrap callbacks

[natebosch]

For example:

R Function(P1, P2) limit2<P1, P2>(R Function(P1, P2) callback) =>
  (p1, p2) => withResource(() => callback(p1, p2));

This would make it easier to use pools for use cases like https://github.com/dart-lang/graphs/issues/39, wrapping in 2 levels of closures in place is pretty ugly.

[natebosch]

thoughts @kevmoo @jakemac53

[kevmoo]

This should be a language feature. Thinking of all of the flavors of bind we have in the Zone API...

[natebosch]

https://github.com/dart-lang/language/issues/157