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Implement AWS-S3 cloud storage backend
The new C++ API allows to implement other backends than the filesystem. The first to implement is AWS-S3. There is a mock-up implementation for this already. In order to actually implement it, the functionality in the s3 namespace needs to be implemented using the aws-c++-sdk. For reference, see the implementation in namespace filesystem.
Any help with this is welcome, including WIP PRs that only implement parts of this. I think good first steps to implement this are:
- Implement the file handle
- Implement read and write attributes.
- Make some test data available with n5-java-aws or zarr-python.
I started to implement this in #139.