Move controllers into their own module

[GDYendell]

No description provided.

[codecov]

Codecov Report

❌ Patch coverage is 88.88889% with 2 lines in your changes missing coverage. Please review.
✅ Project coverage is 84.86%. Comparing base (a735ba8) to head (33e75a0).
⚠️ Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
src/fastcs_eiger/__main__.py	0.00%	2 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##             main      #81   +/-   ##
=======================================
  Coverage   84.86%   84.86%           
=======================================
  Files          13       13           
  Lines         403      403           
=======================================
  Hits          342      342           
  Misses         61       61           

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