Make ControllerVector generic on Controller_T

[shihab-dls]

closes #325

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 90.86%. Comparing base (dbb85c4) to head (56e4c85).
⚠️ Report is 4 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #326      +/-   ##
==========================================
+ Coverage   90.85%   90.86%   +0.01%     
==========================================
  Files          70       70              
  Lines        2547     2550       +3     
==========================================
+ Hits         2314     2317       +3     
  Misses        233      233              

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