Support both PUT and POST presigned URLs

[alahiff]

Currently POST presigned URLs are used to upload files to S3, as this enables S3 to validate both the checksum and file size. However, this isn't supported by some S3-compatible storage systems (like PowerScale).

The server will be modified to support both. For a PUT presigned URL the value of fields will be null in the json (i.e. None in python). So in the python API:

• fields is null: use a PUT,
• fields has content: use a POST

The file simvue/api/objects/artifact/base.py needs to be updated. So this:

        _response = sv_post(
            url=_url,
            headers={},
            params={},
            is_json=False,
            timeout=timeout,
            files={"file": file},
            data=self._init_data.get("fields"),
        )

needs to be replaced with something like:

        if self._init_data.get("fields") is not None:
            _response = sv_post(
                url=_url,
                headers={},
                params={},
                is_json=False,
                timeout=timeout,
                files={"file": file},
                data=self._init_data.get("fields"),
            )
        else:
            with open(file, "rb") as fh:
                _response = requests.put(_url, data=fh)