Add Emissions connectors as an extension

[ctessum]

We can add an emissions connector extension using the same methodology described here: https://github.com/EarthSciML/AtmosphericDeposition.jl/issues/22

We can take the actual code for the connector from here: https://github.com/jialinl6/box_model/blob/c65a56a328d865c119f2148efabb9d72bc5641b7/s_f_e.jl#L16

And here: https://github.com/jialinl6/box_model/blob/c65a56a328d865c119f2148efabb9d72bc5641b7/s_f_e.jl#L78

(Also add tests and documentation

[ctessum]

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On Friday, 23-Feb-24 21:18:47 UTC by Gov4Git dev

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[ctessum]

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On Monday, 26-Feb-24 15:47:18 UTC by Gov4Git dev

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This issue's priority score is now 3.000000. The cost of priority is 9.000000. The projected bounty is now 9.000000.

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