refactor: refactoring http request creation and sending (#395)

* refactoring http request creation and sending

* fix lint error

* increase the test coverage of client.go

* refactor: Change the style of HTTPRequestBuilder.Build func to one-argument-per-line.

edits.go

@@ -32,7 +32,7 @@ type EditsResponse struct {
 
 // Perform an API call to the Edits endpoint.
 func (c *Client) Edits(ctx context.Context, request EditsRequest) (response EditsResponse, err error) {
-	req, err := c.requestBuilder.Build(ctx, http.MethodPost, c.fullURL("/edits", fmt.Sprint(request.Model)), request)
+	req, err := c.newRequest(ctx, http.MethodPost, c.fullURL("/edits", fmt.Sprint(request.Model)), withBody(request))
 	if err != nil {
 		return
 	}