ReSchema - add helper functions for validators

[fakenickels]

So we can add more data in the validator constructors without hurting usability.

StringMin(Name, 20)
StringMax(Name, 20)

would become

string(~min=20, ~max=60, Name)

or

string(~min=20, Name)

or even finally add a label argument for better errors!

string(~min=20, ~label="Nome", Name)

in the end string is just a function that will return an array of the proper constructors for ReSchema

[fakenickels]

And of course we would provide a https://comby.dev script for easy conversion, both syntaxes would still be valid! ✨

[fakenickels]

Closed by https://github.com/Astrocoders/reform/pull/171