Feature description

• Async version of Validate method.
• Validation is fast enough that I don't believe we need async/await just for sake of having it.
  • Task & thread orchestration would probably take more time than the validation itself.
• However the async version could be useful when validation tries to handle large collections.

Feature in action

var validator = Validator.Factory.Create(specification, settings => settings
    .WithTaskScheduler(taskScheduler)
)

Specification<object[]> specification = s => s
    .AsCollection(itemSpecification)
    .WithAsyncStrategy(); // will use some default strategy

 // will use the async version only if more than 10k items, validating 100 items in a single task:

Specification<object[]> specification = s => s
    .AsCollection(itemSpecification)
    .WithAsyncStrategy(bulkSize: 100, minCount: 10000);

var result1 = validator.Validate(hugeCollection); // under the hood it triggers async collection validation anyway

var result2 = await validator.Validate(hugeCollection); // same as above, but bubbles up the task?

Feature details

• Async strategy would be used for collections only (parameter command that affects AsCollection).
• Task orchestration done with task scheduler set in the settings.
• ValidationContext would need to be created for each bulk and at the end - all the contexts from all of the bulks would be merged into the master one.
  • At the same time, it would be nice that the original ValidationContext continue with the regular validation in other places.