Vectordata streaming support for examples/bench [Updated]

[jshook]

This extends the examples/bench capabilities in jvector:

The DataSet type is virtualized behind an interface
The way DataSets are loaded is more modular
A DataSet loader has been added to support the vectordata API
The net effect is that bench can no access vectordata hosted datasets.
The benefits of this are several:

remote vector test data hosting
uniform API for finding and using vector datasets
merkle-based automatic download of chunks for dynamic access
efficient download and automatic caching of data locally on test nodes
mapping and ranging subsets of data, such as "first 1M", "first 10M" and so on under profile names
packing various vector data views in a consistent API: base, query, ...
management of datasets via catalogs, orthogonal to access control
Most of the core wiring of these capabilities is provided by another library which is part of the nosqlbench project. The changes to jvector are to adapt it to use these APIs.

There are a couple issues yet to resolve with the Java version configs and GHA.

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