Gcapi

- Fix `reader_study.ground_truth`

- Added `client.images.download`
- Removed deprecated `client.raw_image_upload_session_files`

- **Breaking Change** Switched the backend from `requests` to `httpx`
- **Breaking Change** Removed `client.get_algorithm(algorithm=...)`,
use `client.algorithms.detail(slug=...)` instead
- Added `AsyncClient` for asynchronous interation with the Grand
Challenge API
- Added option for getting objects by filters in detail view
- Added optional `timeout` parameter to client
- Removed deprecated `algorithm` argument to `upload_cases`
- Added optional `answer` argument to `upload_cases`
- Added `archives` endpoint
- Added `MASK` answertype
- Added optional `follow_redirects`
argument to `Client.__call__`

- Added `run_external_job` to execute algorithms directly
- Deprecated the `algorithm` argument to `upload_cases` which will be
removed in 0.5.0, use `run_external_job` instead

- Allow same domain calls
- Normalize API tokens

- Fix number answer type support for readerstudy validation