Add `SetQueryParamInt`/`Bool` methods to directly serialize bool and int for `resty.Request`

[takanuva15]

Right now the SetQueryParam method only accepts string, which forces developers to write conversion code to reformat bools and ints to string. bool is a very common query parameter type used for filtering results from an endpoint, while int is used all the time for things like pagination.

To make resty easier to use with these common go types, I would like to add two methods to the client:
SetQueryParamInt(param string, value int)
and
SetQueryParamBool(param string, value bool).

These can call strconv.Itoa and strconv.FormatBool in their implementation to generate the required strings for the query param url.

EDIT: If we can add a similar method for Path Params like SetPathParamInt, that would be great as well

[jeevatkm]

@takanuva15 Thanks for the bringing the feature request. I'm sorry for the delayed response, I was occupied with my personal stuff.