Add XHR interceptor - Githubissues

This will allow users to use XHR and HttpClient as well and won't require them to add the axios interceptors manually each time.

Remaining TODOs for this PR

[x] Fix extra debug logging (since we are creating an instance of the modified version and calling that as well
[x] Testing with HttpClient
[x] Testing with XHR
[x] Check if we can just assign to actual.onerror, actual.onload,actual.onreadystatechangeandactual.onloadend` without checking about if those features are available.
[x] Check default value of withCredentials
[x] Migration method - if this method is buggy, how can users disable this entirely and fallback on older axios interception?
[x] Test with vue's axios library
[ ] Test in all browsers + phone browsers
[x] How to properly handle errors in try / catch of handleResponse function?
[ ] Add limit on number of retries for unauthorised response sending (maybe not needed since others dont have this either)
[ ] All example apps work -> especially the ones that monkey patch axios / fetch on the frontend
[x] Test 2+ level of recursion with refreshing
[x] Test error conditions:
- [x] > 400 error messages are correctly propagated.
- [x] Network errors are properly propagated
- [x] Errors during refresh are properly propagated.
[x] Check what happens when axios interceptor is added as well and what we can do about those situations.
[x] Cleanup code
[x] What about react native?
[x] Session claims related changes (handling 403 response code)
[x] setRequestHeader should append or overwrite duplicate keys?
[x] In axios2 tests, we commented out the part were we check the URL from the error -> can we / should we fix this?
[ ] Test with Apollo client (web + react native)

supertokens / supertokens-website

Add XHR interceptor #154

Remaining TODOs for this PR