[FEA] Vertex and edge property support.

[seunghwak]

As pre-requsites for https://github.com/rapidsai/cugraph/issues/2143 and https://github.com/rapidsai/cugraph/issues/2433, we need a wrapper class to store vertex property values (which can be a simple 1D array without vertex masking, this does not hold anymore with vertex masking, need a wrapper class to hide complexity) and another class to store edge property values (in addition to the edge weight).

• [ ] Update the current edge_partition_src|dst_property_t to support vertex/edge source|destination/edge property values in a consistent and efficient way.
• [ ] Add a wrapper class for vertex property values
• [x] Add a new class for edge property values.

[ChuckHastings]

We have added support for edge properties.

We still manage vertex properties using rmm::device_uvector, which exposes internal implementation and prevents support for vertex masking and some other optimizations we might consider.