Separate Layout Parsing from Window Management

[abstractlyZach]

By separating layout parsing from window management, we can prepare for window resizing and keep it separate from window spawning. It'll be easier to test and more decoupled

[codecov-commenter]

Codecov Report

Merging #38 (12ce2e4) into main (15b426d) will not change coverage.
The diff coverage is 100.00%.

@@            Coverage Diff            @@
##              main       #38   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files            9         9           
  Lines          214       217    +3     
  Branches        22        24    +2     
=========================================
+ Hits           214       217    +3     

Impacted Files	Coverage Δ
src/magic_tiler/magic_tiler.py	100.00% <100.00%> (ø)
src/magic_tiler/utils/dtos.py	100.00% <100.00%> (ø)
src/magic_tiler/utils/layouts.py	100.00% <100.00%> (ø)

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