[FEA] Python API for memory tracking resources

[achirkin]

PR #2973 introduces a new raft::memory_tracking_resources that samples all resource-based memory usage:

  // optionally pass an existing resource handle
  raft::resources res;

  // The tracking handle is a child of resource handle; it wraps all memory resources with statistics adaptors
  raft::memory_tracking_resources tracked(res, "allocations.csv", std::chrono::milliseconds(1));

  // All allocations are logged to a .csv as long as `tracked` is alive
  cuvs::neighbors::cagra::build(tracked, ...);

It would be nice to have this feature exposed in the python API as well. The memory tracking resource handle can be exposed exactly the same way as the normal resource handle, so the implementation shouldn't be too complicated.

[eskayML]

looks like the python api is missing the memory tracking resources feature. we can probably expose it by wrapping the c++ implementation in a pybind11 wrapper, similar to how other resources are handled. should i open a pr for this?