Make the internal grid and empties_built in Grid class private

[Tortar]

The internal grid in the Grid class should be made private as was done in #815, the internal mechanic of the class should not be used by the user (if he doesn't really want to do so) and we should be free to change it as we want if needed.

Something should be changed in the tests folder also, but I'd like to finish the PR when it gets some approval :-)

[rht]

Yeah, I agree with this proposal.

And in general, it is indeed more effective if you sketch a draft PR and wait for agreement, so that your effort is not wasted.

[Tortar]

will do that more often!

[codecov]

Codecov Report

Base: 82.13% // Head: 82.13% // No change to project coverage 👍

Coverage data is based on head (ff048e2) compared to base (b36fce7).
Patch coverage: 83.33% of modified lines in pull request are covered.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1568   +/-   ##
=======================================
  Coverage   82.13%   82.13%           
=======================================
  Files          18       18           
  Lines        1388     1388           
  Branches      272      272           
=======================================
  Hits         1140     1140           
  Misses        204      204           
  Partials       44       44           

Impacted Files	Coverage Δ
mesa/space.py	91.39% <83.33%> (ø)

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[Tortar]

Everything should be done now, I realized that also empties_built shouldn't be public because it's an internal optimization, so I put all together in this PR, hope this is welcomed!

[rht]

Grid.grid has been a public attribute, but it has never been endorsed in the docs, so I think it's fine to make it private without having to wait to do the change in Mesa 2.0.