feat: add OSTK_PHYSICS_DATA_LOCAL_REPOSITORY environment setting to set all at once

[kyle-cochran]

When installing OSTk into a new environment, if the default data files path isn't to your liking, you have to set 7 environment variable to make sure all of the data are put into the correct place. This is a bit annoying and causes problem when new data are added to physics, because users do not know to add the new settings.

This adds a single configuration env var called OSTK_PHYSICS_DATA_LOCAL_REPOSITORY that let's you set the location for all data at once. The original environment variable are still available and override this one.

Addresses: #179

[codecov]

Codecov Report

Merging #181 (a45f3e3) into main (931cf74) will increase coverage by 0.00%.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##             main     #181   +/-   ##
=======================================
  Coverage   79.87%   79.87%           
=======================================
  Files          93       93           
  Lines        7448     7460   +12     
=======================================
+ Hits         5949     5959   +10     
- Misses       1499     1501    +2     

Files	Coverage Δ
...hysics/Coordinate/Frame/Providers/IERS/Manager.cpp	75.35% <100.00%> (-0.15%)	⬇️
src/OpenSpaceToolkit/Physics/Data/Manager.cpp	78.14% <100.00%> (-0.38%)	⬇️
.../Physics/Environment/Atmospheric/Earth/Manager.cpp	87.54% <100.00%> (-0.28%)	⬇️
.../Physics/Environment/Ephemerides/SPICE/Manager.cpp	86.66% <100.00%> (+1.43%)	⬆️
...hysics/Environment/Gravitational/Earth/Manager.cpp	83.11% <100.00%> (-0.44%)	⬇️
...kit/Physics/Environment/Magnetic/Earth/Manager.cpp	83.64% <100.00%> (-0.43%)	⬇️

... and 1 file with indirect coverage changes

[apaletta3]

Epic kyle! Great idea!