Adding default resp size to options

[Mzack9999]

Proposed changes

Closes #3988

Checklist

• Pull request is created against the dev branch
• All checks passed (lint, unit/integration/regression tests etc.) with my changes
• I have added tests that prove my fix is effective or that my feature works
• I have added necessary documentation (if appropriate)

Example

With the code snippet in the linked issue:

$ cat test.go
...go
outputWriter := testutils.NewMockOutputWriter()
outputWriter.WriteCallback = func(event *output.ResultEvent) {
	fmt.Printf("\n\n\nGot Result: %+v\n", event.Response)
}
...
$ go run .
[INF] Using Interactsh Server: oast.site

Got Result: HTTP/1.1 200 OK
Connection: close
Content-Length: 2
Content-Type: text/plain; charset=utf-8
Date: Mon, 14 Aug 2023 09:14:05 GMT

ok

[tarunKoyalwar]

lgtm !

tracking issue of syncing defaults between SDK and goflags default in new SDK issue #4054