Add method into struct `Request` to accept type `url.Values` for Query strings

[jeevatkm]

Refer to #166 (comment)

[jeevatkm]

I have analyzed, it seems there are methods already exists in Resty to accept url.values for Query Parameters and Form Data.

So I will do following changes, for easy understanding:

• Refactor method from SetMultiValueQueryParams to SetQueryParamsFromValues
• Refactor method from SetMultiValueFormData to SetFormDataFromValues

[jeevatkm]

It's done 😄

[moorereason]

This should be labeled as a breaking change.