Poor performancewhen constructing `edge_node`, `face_edge` and `face_face` connectivity

[philipc2]

I've observed very poor performance when constructing the Grid.edge_node_connectivity and Grid.face_edge_connectivity.

The timings below were taken on a single NCAR Derecho CPU node.

• AMD EPYC™ 7763 Milan processors
• Dual-socket nodes, 64 cores per socket
• 256 GB DDR4 memory per node

Resolution	Nodes	Faces	Edges	Grid Load Time (s)	Connectivity Construction Time (s)	Total Time (s)
30km	1,310,720	655,362	1,966,080	2.023	9.37	11.393
15km	5,242,880	2,621,442	7,864,320	7.673	39.987	47.66
7.5km	20,971,520	10,485,762	31,457,280	28.716	99.309	128.025
3.75km	83,886,080	41,943,042	125,829,120	113.943	406.8	520.743

The timing for the 15km grid seems inconsistent with the others, since there's an expected scaling of about 4x. The others follow this trend.

Currently, we have the following implementation.

https://github.com/UXARRAY/uxarray/blob/a6aa6294975f189e8c36dd3d14da745526e53e06/uxarray/grid/connectivity.py#L181-L238