`feat`: implement `Graph` with canonical orientations

[FiberedSkies]

Description

Implement a Graph variant of the current general cell complex implementation using Cell and Skeleton with canonical orientations. Canonical orientation over a graph being that for any edge, one of the two restrictions is negative. This would significantly simplify the work flow for standard graph structured datasets, effectively making it completely end-to-end training.

Details

• implement Graph as a specific Skeleton with only 0-cells (nodes) and 1-cells (edges)
• implement a builder pattern for a CellularSheaf with canonical orientations and initialized restrictions from a Graph