Dcor-shared

- fix: handle case in wait_for_resource when resource is not yet in CKAN

- BREAKING CHANGE: presigned URLs for uploading resources now work
differently. For small files (< 1 GiB), a single upload URL for
PUT is created. For larger files, a multipart upload is started.
- enh: retry set_object_tagging on failure

- feat: add convenience method `get_s3_attributes_for_artifact`

- feat: introduce `testing.make_dataset_via_s3` and
`testing.make_resource_via_s3` which uploads resources via S3
- enh: make sha256 optional in `s3.upload_file`

- feat: introduce `get_resource_dc_config`, `get_resource_info`, and
`s3cc.get_s3_dc_handle_basin_based`
- enh: return S3 URL in s3cc.upload_artifact
- enh: make specifying owner organization and create context in
`testing.make_dataset` optional

- fix: disable basins when loading a dataset instance
- enh: implement s3cc.upload_artifact