Define a C API for data masking

[ChuckHastings]

Add a C API for data masking.

Closes #2571

The objective here is to add a C API that will allow us to associated a data mask with a graph. Basic functions:

• Create a data mask
• Destroy a data mask
• Associated a data mask with a graph
• Disassociated a data mask from a graph
• Discover what data mask is associated with a graph

Current plan is to allow for the creation of a mask by the caller (the python layer for our current use case) and have it passed in. We may later add support for other techniques.

This PR can be approved independently, but implementation of the API is dependent on #2679

[ChuckHastings]

rerun tests

[naimnv]

@ChuckHastings I wonder, how the association between a graph and mask would be kept?
If the caller explicitly maintains that association then it's understood.
Apart from that, the API looks very transparent to me.

[ChuckHastings]

@ChuckHastings I wonder, how the association between a graph and mask would be kept?
If the caller explicitly maintains that association then it's understood.
Apart from that, the API looks very transparent to me.

My intention was to support the C API's graph object to maintain that connection. Sequence of operations would be:

1. Create a data mask with the call cugraph_data_mask_create
2. Associate data mask with a graph with the call cugraph_graph_add_data_mask
3. Caller can now forget the details of the data mask, as it is part of the graph object
4. If you need to fetch the data mask, the caller can call cugraph_graph_get_data_mask to rediscover that object
5. cugraph_graph_release_data_mask removes the association of the data mask with the graph
6. cugraph_data_mask_destroy destroys the data mask. This is required if the mask has been released from the graph, but if the mask is still associated with the graph then when the graph is destroyed this would automatically be called

[codecov-commenter]

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[BradReesWork]

@gpucibot merge