Add AsyncPredicate - Matchers with AsyncExpressions

[younata]

• This adds AsyncPredicate, a companion to Predicate which works with AsyncExpression for creating matchers that can utilize async/await.
• AsyncPredicate does not replace or subsume Predicate, this is an entirely additive change.
• Creates an async variant of containsElementSatisfying that takes in an async function. Does not replace the existing containsElementSatisfying.
• Creates variants of satisfyAnyOf and satisfyAllOf that take in both AsyncPredicate and Predicate. Again, these do not replace the existing satisfyAnyOf/satisfyAllOf matchers, but instead complements them so that you can compose matchers that use both AsyncPredicate and traditional Predicate.
• Creates async variants of allPass.
• Updates documentation.

Checklist - While not every PR needs it, new features should consider this list:

• Does this have tests?
• Does this have documentation?
• Does this break the public API (Requires major version bump)?
• Is this a new feature (Requires minor version bump)?