Support onDownloadProgress in ApiRequestOptions

[lukqw]

Describe the solution you'd like
I'd like to make axios requests with the onDownloadProgress option.
For that I need ApiRequestOptions to include readonly onDownloadProgress?: (progressEvent: ProgressEvent) => void;
Furthermore I need this field to be unwrapped into the requestConfig of the sendRequest method.

Maybe in general a way of extending axios request options would be nice?

[Or-Zarchi-Forter]

I've created a PR that can solve this by allowing an axios custom instance, #1434. Please comment there so it will get attention 😄

[50Bytes-dev]

Check my PR #1682

[mrlubos]

@lukqw did you get it working?