refactor ModularServer (moving code into __init__)

[Holzhauer]

Refactoring of ModularServer to allow tests as requested in https://github.com/projectmesa/mesa/pull/1296#issuecomment-1197877103

[codecov[bot]]

Codecov Report

Merging #1403 (80f5bef) into main (1ad2456) will decrease coverage by 0.12%. The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main    #1403      +/-   ##
==========================================
- Coverage   91.16%   91.03%   -0.13%     
==========================================
  Files          18       18              
  Lines        1358     1361       +3     
  Branches      261      262       +1     
==========================================
+ Hits         1238     1239       +1     
- Misses         85       86       +1     
- Partials       35       36       +1     

Impacted Files	Coverage Δ
mesa/visualization/ModularVisualization.py	78.06% <100.00%> (-0.89%)	:arrow_down:

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[rht]

LGTM

[rht]

Merged, thank you!