feat: add `ToFile` support to write the response into a file

[chengxiangdong]

What this PR does / why we need it:

Which issue this PR fixes: (optional, in fixes #<issue number>(, fixes #<issue_number>, ...) format, will close that issue when PR gets merged) fixes #xxx

Special notes for your reviewer:

Release note:

PR Checklist

• [x] Tests added/passed.
• [ ] Documentation updated.
• [ ] Schema updated.

Example

output_file := w.Get("output_file")
err = httphelper.New(client).
	Method("GET").
	URI(uri).
	Query(params).
	MarkerPager("address_groups", "page_info.next_marker", "marker").
	ToFile("address_groups", outputFile)