Remove FormattingRegistry/Quantity/Unit in favor of the Formatter del… #1092

Job	Run time
test-macos (3.9)	24s
test-macos (3.9, numpy>=1.21,<2.0.0)	31s
test-linux (3.9)	24s
test-macos (3.10)	22s
test-linux (3.9, uncertainties==3.1.6)	25s
test-macos (3.10, numpy>=1.21,<2.0.0)	27s
test-linux (3.9, uncertainties>=3.1.6,<4.0.0)	37s
test-macos (3.11)	28s
test-linux (3.9, numpy>=1.21,<2.0.0)	49s
test-macos (3.11, numpy>=1.21,<2.0.0)	37s
test-linux (3.9, numpy>=1.21,<2.0.0, uncertainties==3.1.6)	24s
test-linux (3.9, numpy>=1.21,<2.0.0, uncertainties>=3.1.6,<4.0.0)	27s
test-linux (3.10)	16s
test-linux (3.10, uncertainties==3.1.6)	18s
test-linux (3.10, uncertainties>=3.1.6,<4.0.0)	32s
test-linux (3.10, numpy>=1.21,<2.0.0)	19s
test-linux (3.10, numpy>=1.21,<2.0.0, uncertainties==3.1.6)	20s
test-linux (3.10, numpy>=1.21,<2.0.0, uncertainties>=3.1.6,<4.0.0)	1m 6s
test-linux (3.11)	24s
test-linux (3.11, uncertainties==3.1.6)	17s
test-linux (3.11, uncertainties>=3.1.6,<4.0.0)	22s
test-linux (3.11, numpy>=1.21,<2.0.0)	19s
test-linux (3.11, numpy>=1.21,<2.0.0, uncertainties==3.1.6)	26s
test-linux (3.11, numpy>=1.21,<2.0.0, uncertainties>=3.1.6,<4.0.0)	25s
test-linux (3.9, numpy, matplotlib==2.2.5)	1m 17s
test-linux (3.9, numpy, uncertainties, sparse xarray netCDF4 dask[complete]==2023.4.0 graphviz ba...	2m 46s
test-windows (3.9, numpy>=1.21,<2.0.0)	49s
test-windows (3.10, numpy>=1.21,<2.0.0)	45s
test-windows (3.11, numpy>=1.21,<2.0.0)	53s
	17m 29s

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