Add some `Unitful` unit names that were missing

[MichaelHatherly]

There are a couple of differences between the naming of units in Unitful and this package that makes it not quite a direct swap when changing between the two packages. This adds a couple of aliases for current units as well as a new wk.

The only one that we're really needing here is wk since we can deal with aliasing the others internally where needed, so I'm fine with dropping those if there are reasons that they weren't included already?

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How would you like tests written for these kinds of additions? If they are needed?

[github-actions[bot]]

Benchmark Results

	main	2178c8d50f10ef...	t[main]/t[2178c8d50f10ef...]
Quantity/creation/Quantity(x)	3.4 ± 0 ns	3.7 ± 0.1 ns	0.919
Quantity/creation/Quantity(x, length=y)	3.4 ± 0 ns	3.6 ± 0.1 ns	0.944
Quantity/with_numbers/*real	3.1 ± 0.1 ns	3 ± 0.1 ns	1.03
Quantity/with_numbers/^int	12 ± 4.1 ns	11.8 ± 4 ns	1.02
Quantity/with_numbers/^int * real	12.2 ± 4.7 ns	12.1 ± 4.8 ns	1.01
Quantity/with_quantity/+y	7.1 ± 0 ns	7.1 ± 0.1 ns	1
Quantity/with_quantity//y	3.7 ± 0 ns	3.7 ± 0 ns	1
Quantity/with_self/dimension	1.7 ± 0 ns	1.7 ± 0 ns	1
Quantity/with_self/inv	3.5 ± 0.2 ns	3.4 ± 0.2 ns	1.03
Quantity/with_self/ustrip	1.7 ± 0 ns	1.7 ± 0 ns	1
QuantityArray/broadcasting/multi_array_of_quantities	0.233 ± 0.028 ms	0.232 ± 0.03 ms	1.01
QuantityArray/broadcasting/multi_normal_array	0.0772 ± 0.0027 ms	0.0769 ± 0.0026 ms	1
QuantityArray/broadcasting/multi_quantity_array	0.255 ± 0.0017 ms	0.255 ± 0.0016 ms	1
QuantityArray/broadcasting/x^2_array_of_quantities	0.0639 ± 0.017 ms	0.0645 ± 0.016 ms	0.991
QuantityArray/broadcasting/x^2_normal_array	12.5 ± 3.4 μs	12.5 ± 3.7 μs	1
QuantityArray/broadcasting/x^2_quantity_array	13.3 ± 1.3 μs	13.4 ± 1.2 μs	0.993
QuantityArray/broadcasting/x^4_array_of_quantities	0.15 ± 0.0075 ms	0.148 ± 0.0066 ms	1.01
QuantityArray/broadcasting/x^4_normal_array	0.0719 ± 0.0029 ms	0.0708 ± 0.003 ms	1.02
QuantityArray/broadcasting/x^4_quantity_array	0.108 ± 0.0015 ms	0.107 ± 0.0026 ms	1.01
time_to_load	0.214 ± 0.00081 s	0.216 ± 0.0031 s	0.991

Benchmark Plots

A plot of the benchmark results have been uploaded as an artifact to the workflow run for this PR. Go to "Actions"->"Benchmark a pull request"->[the most recent run]->"Artifacts" (at the bottom).

[MilesCranmer]

Looks good! The one suggestion I have is to mention these units and aliases in this line:

    "Time in seconds. Available variants: `fs`, `ps`, `ns`, `μs` (/`us`), `ms`, `min`, `h` (/`hr`), `day`, `yr`, `kyr`, `Myr`, `Gyr`.",

[MilesCranmer]

Thanks for the addition 👍

[MichaelHatherly]

Thanks Miles.