feat(validators): add default option for fastest

[intech]

add default option useNewCustomCheckerFunction: true for fastest, old custom method deprecated

TODO:

• [ ] adding tests new and old custom methods
• [ ] adding backward compatibility example
• [ ] update docs on site

[intech]

this example with new custom function and site docs

[icebob]

It's a breaking change can't be merged in 0.14