Add Emission model as extension

[jialinl6]

Fixes #37

Captures https://github.com/EarthSciML/GasChem.jl/issues/37

[jialinl6]

The tests on GitHub failed due to an issue with downloading the NEI2016 emission data. However, both the unit tests (Pkg.test())and the documentation ran successfully on a local environment. Composing models · GasChem.jl.pdf

[jialinl6]

I created a fundamental base model for emissions Emission() in the /src/emission.jl. This approach was chosen because defining Emission() solely as an extension does not allow for its exportation and use, even after the extension was precompiled. It appears that extensions are better suited for modifying existing functions rather than introducing new ones. Similar situation found here:https://github.com/pebeto/julia_extensions_example

[ctessum]

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On Saturday, 16-Mar-24 18:30:10 UTC by Gov4Git dev

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Started managing this PR as Gov4Git proposal 43 with initial approval score of 0.000000.

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[codecov[bot]]

Codecov Report

Attention: Patch coverage is 72.50000% with 11 lines in your changes are missing coverage. Please review.

Project coverage is 97.78%. Comparing base (683069c) to head (4aa05c6).

Files	Patch %	Lines
src/emission.jl	15.38%	11 Missing :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #43 +/- ## ========================================== - Coverage 99.45% 97.78% -1.67% ========================================== Files 7 9 +2 Lines 547 587 +40 ========================================== + Hits 544 574 +30 - Misses 3 13 +10 ```

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On Friday, 12-Jul-24 16:24:53 UTC by Gov4Git dev

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