Extend vtkAlgorithm API fo cleaning cache
The following discussion from !8222 (merged) should be addressed:
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@utkarsh.ayachit started a discussion: (+1 comment)
Can we add a more to the filter to free up all these locators at end of
RequestData? I am thinking for insitu cases, we'll soon end up with filters building such acceleration structures that don't get freed up causing memory issue. Having some API to cleanup caches may be a good approach to explore. Doesnt' need to happen in this MR, but something to think about -- maybe it's an API onvtkAlogorithmitself.