feat(form): add setValue method to FormGroup class

[ayoayco]

✨ Desired outcome: a new setValue method in the FormGroup class that allows setting the values of the form controls given an argument with the following shape:

type ValueParam = Record<string, ValueType>; // where ValueType (doesn't exist yet) is the acceptable values for all FormControl types

// for example
const values = {
  userName: 'value',
  email: 'invalid-email'
}

// then using setValue
form.setValue(values)

// ... will call control.setValue if the key matches the name of the control

[NeilAn99]

Hey, I would like to try working on this.

[ayoayco]

Thank you, @NeilAn99! I have reviewed your PR :)