Add in direct aerosol species forcing in 45-species FaIR

[chrisroadmap]

Pull request

Please confirm that this pull request has done the following:

• [x] Tests added
• [ ] Documentation added (where applicable) [N/A - temp hack]
• [ ] Example added (either to an existing notebook or as a new notebook, where applicable) [N/A - temp hack]
• [x] Description in CHANGELOG.rst added

[codecov[bot]]

Codecov Report

Merging #82 into master will increase coverage by 0.04%. The diff coverage is 96.00%.

@@            Coverage Diff             @@
##           master      #82      +/-   ##
==========================================
+ Coverage   94.75%   94.79%   +0.04%     
==========================================
  Files          42       42              
  Lines        1773     1787      +14     
==========================================
+ Hits         1680     1694      +14     
  Misses         93       93              

Impacted Files	Coverage Δ
fair/forward.py	80.45% <95.23%> (+0.55%)	:arrow_up:
fair/forcing/aerosols.py	92.72% <100.00%> (+0.41%)	:arrow_up:

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