support timedelta in Q_.init #1218

Job	Run time
test-macos (3.10)	1m 8s
test-windows (3.10, numpy>=1.23,<2.0.0)	1m 9s
test-macos (3.10, numpy>=1.23,<2.0.0)	1m 19s
test-windows (3.11, numpy>=1.23,<2.0.0)	1m 9s
test-macos (3.11)	1m 1s
test-windows (3.12, numpy>=1.23,<2.0.0)	1m 39s
test-linux (3.10)	1m 37s
test-macos (3.11, numpy>=1.23,<2.0.0)	1m 8s
test-linux (3.10, uncertainties==3.1.6)	1m 46s
test-macos (3.12)	1m 5s
test-linux (3.10, uncertainties>=3.1.6,<4.0.0)	1m 41s
test-macos (3.12, numpy>=1.23,<2.0.0)	1m 4s
test-linux (3.10, numpy>=1.23,<2.0.0)	1m 47s
test-linux (3.10, numpy>=1.23,<2.0.0, uncertainties==3.1.6)	2m 28s
test-linux (3.10, numpy>=1.23,<2.0.0, uncertainties>=3.1.6,<4.0.0)	2m 25s
test-linux (3.11)	1m 36s
test-linux (3.11, uncertainties==3.1.6)	1m 33s
test-linux (3.11, uncertainties>=3.1.6,<4.0.0)	1m 36s
test-linux (3.11, numpy>=1.23,<2.0.0)	2m 0s
test-linux (3.11, numpy>=1.23,<2.0.0, uncertainties==3.1.6)	2m 12s
test-linux (3.11, numpy>=1.23,<2.0.0, uncertainties>=3.1.6,<4.0.0)	2m 16s
test-linux (3.12)	2m 12s
test-linux (3.12, uncertainties==3.1.6)	2m 9s
test-linux (3.12, uncertainties>=3.1.6,<4.0.0)	2m 18s
test-linux (3.12, numpy>=1.23,<2.0.0)	2m 17s
test-linux (3.12, numpy>=1.23,<2.0.0, uncertainties==3.1.6)	3m 32s
test-linux (3.12, numpy>=1.23,<2.0.0, uncertainties>=3.1.6,<4.0.0)	3m 13s
test-linux (3.10, numpy, matplotlib==2.2.5)	3m 23s
test-linux (3.10, numpy, uncertainties, sparse xarray netCDF4 dask[complete]==2023.4.0 graphviz b...	3m 51s
	56m 34s

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