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Create a metaclass for Singleton's and remove pysingleton #388

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Run time

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Job	Run time
lint	9s
test (3.7, windows-latest)	2m 47s
test (3.14, ubuntu-22.04)	4m 56s
test (3.14, windows-latest)	4m 43s
test (3.14, macos-latest)	2m 38s
test (3.7, ubuntu-22.04)	1m 41s
	16m 54s