Add sectional and exact simulations plus aero_binned type

[jcurtis2]

RunSect and RunSectOpt allow sectional simulations. RunExact and RunExactOpt allow for exact simulation, which can be used to solve the additive coagulation kernel example. Added AeroBinned as both these cases need them to track number and volume concentration of each size bin.

Closes #65

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 97.29730% with 6 lines in your changes missing coverage. Please review.

Project coverage is 90.76%. Comparing base (8ba1e54) to head (96ecea4).

Files with missing lines	Patch %	Lines
src/run_exact_opt.hpp	83.33%	1 Missing and 1 partial ⚠️
src/run_sect_opt.F90	93.10%	1 Missing and 1 partial ⚠️
src/run_exact_opt.F90	95.65%	0 Missing and 1 partial ⚠️
src/run_sect_opt.hpp	92.85%	0 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #426      +/-   ##
==========================================
+ Coverage   90.13%   90.76%   +0.63%     
==========================================
  Files          45       55      +10     
  Lines        2270     2491     +221     
  Branches      127      135       +8     
==========================================
+ Hits         2046     2261     +215     
- Misses        156      158       +2     
- Partials       68       72       +4     

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[slayoo]

@emmacware, this PR includes access to the Bott scheme in PartMC!