'@rxweb/reactive-form-validators' package code optimization

[ajayojha]

Description

If someone is using the only validator or decorator in his/her application then internally the whole code will be included in the final dist package. Which is a bit obnoxious (as per me :)). Because unnecessary code will be included in the final package.

Describe the solution you'd like

Create separate two modules one is for validator and the second one is for the decorator if someone will only use validator then the validator related code will be included otherwise the whole code because internally decorator is using the validator code.