lib: add RegExp primordials

Hello, For this PR I have added RegExp in the primordials eslint And i just have created a line in "/lib/.eslintrc.yaml".

rules:
  no-restricted-globals:
  - name: RegExp 
      message: "Use `const { RegExp } = primordials;` instead of the global."

And just add RegExp.

const {
  // [...]
  RegExp,
} = primordials;

I hope this new PR will help you :x