Use Air

[VisruthSK]

Submission Checklist

• Run unit tests--NA
• Declare copyright holder and agree to license (see below)

Summary

This PR uses Posit's new formatter, Air, running it on PRs and formats the repository once. Closes #1153.

Copyright and Licensing

Please list the copyright holder for the work you are submitting
(this will be you or your assignee, such as a university or company):
Visruth Srimath Kandali

By submitting this pull request, the copyright holder is agreeing to
license the submitted work under the following licenses:

• Code: BSD 3-clause (https://opensource.org/licenses/BSD-3-Clause)
• Documentation: CC-BY 4.0 (https://creativecommons.org/licenses/by/4.0/)

[VisruthSK]

Just added the files to setup formatting for now.

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 91.10%. Comparing base (d67fd53) to head (17c60bc).

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #1199   +/-   ##
=======================================
  Coverage   91.10%   91.10%           
=======================================
  Files          15       15           
  Lines        6125     6125           
=======================================
  Hits         5580     5580           
  Misses        545      545           

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[jgabry]

Just added the files to setup formatting for now.

Great, thanks. Yeah let's wait to do the actual formatting until we're sure we're done making other code changes.