add DataSetInfo and some guards around loading errors

[jshook]

This PR makes dataset loading more robust in the face of file corruption errors.
It also indirects dataset access through DataSetInfo, caching the attached DataSet locally, and enabling access via getDataSet(). This will vastly speed up testing flows which are uneccesssarily processing datasets into memory right when the actual data is not yet accessed.

[UPDATE]

Due to a request for fixing some longer-standing issues, the scope of this PR has increased moderately:

• DataSet loader formats which can not provide metadata (VSF, ...) on their own now pull details from dataset_metadata.yml for VSF. If none such is available, an error should be thrown.

• Addtionally, the contract type (DataSetProperties) is now a layer of requirements added onto the DataSetInfo type, including an indicator for dataset preprocessing aspects (zero vectors, dupes) and normalization.

• surefire tests were disabled in examples. enabled, and fixed up a unit test

• DataSetProperties is a carrier type in the new DataSetInfo contract

After this change, any dataset which is loaded where the VSF can't be resolved from some definitive source will cause an error to be thrown, as it should.

[github-actions]

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[MarkWolters]

LGTM

[tlwillke]

I tried it out and like it. Please review my two pieces of feedback. One is easy (HDF5 download notification) and should be addressed now. The other (similarity function) may require more discussion and a new issue.