Support constraint checking for :id

[kirega]

Firstly, I must express my appreciation for the wonderful work that you have done in creating this library. It seamlessly solves an otherwise mundane task.

To keep the lib growing, I suggest adding support for validation checking for type :id, I think it's the most common way that people type their id fields. At present to have this lib added to an existing project is not easy without necessitating breaking changes.
There may be underlying decisions as to why the id is not presently supported, and I am happy to hear from you the reasoning behind the choice.
I am happy to raise a PR with the proposed changes.
Again, awesome work. Looking forward to hearing from you.

[DReigada]

Thank you for the input @kirega! PRs are totally welcome
What would you see as the check for an :id type?

[kirega]

What i have mostly used the id type for is for uuid checks and length as well, in a way the same checks that are available for string types can be used, alongside the format ones.