Implement `EquivariantPowerSpectrum` (#360) #1398

Job	Run time
sdist	16s
arm64 Linux (torch v2.1)	37m 48s
arm64 macOS (torch v2.1)	3m 16s
x86_64 Linux (torch v2.1)	3m 24s
x86_64 Linux	2m 33s
x86_64 macOS (torch v2.1)	6m 15s
arm64 Linux	28m 2s
x86_64 Windows (torch v2.1)	12m 22s
arm64 Linux (torch v2.2)	38m 20s
x86_64 macOS	2m 55s
arm64 macOS (torch v2.2)	1m 57s
M1 macOS	2m 28s
x86_64 Linux (torch v2.2)	3m 43s
x86_64 Windows	5m 41s
x86_64 macOS (torch v2.2)	6m 23s
x86_64 Windows (torch v2.2)	13m 15s
arm64 Linux (torch v2.3)	38m 55s
arm64 macOS (torch v2.3)	2m 23s
x86_64 Linux (torch v2.3)	3m 26s
x86_64 Windows (torch v2.3)	8m 31s
arm64 Linux (torch v2.4)	42m 39s
arm64 macOS (torch v2.4)	2m 36s
x86_64 Linux (torch v2.4)	3m 31s
x86_64 Windows (torch v2.4)	9m 7s
arm64 Linux (torch v2.5)	39m 27s
arm64 macOS (torch v2.5)	2m 11s
x86_64 Linux (torch v2.5)	3m 33s
x86_64 Windows (torch v2.5)	7m 12s
merge featomic-torch x86_64 Linux	12s
merge featomic-torch arm64 Linux	12s
merge featomic-torch x86_64 macOS	15s
merge featomic-torch arm64 macOS	15s
merge featomic-torch x86_64 Windows	15s
Merge and release wheels/sdists	6s
	5h 33m 24s

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