fix: optimize Rotate displacement! matrix operations (#604)

[Mxyank24]

Fixes #604

Refactored Rotate displacement functions to use loop fusion (@.) and deg2rad. This eliminates intermediate array allocations (e.g., x .- cx) in the hot loop, resolving the 10x slowdown.

[cncastillo]

Thank you so much! :) waiting for tests to pass and we will register a new version of KomaMRIBase.

[Mxyank24]

Thank you so much! :) waiting for tests to pass and we will register a new version of KomaMRIBase.

My pleasure sir.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 89.82%. Comparing base (fa76b7b) to head (c9a36e8).

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #787      +/-   ##
==========================================
- Coverage   89.83%   89.82%   -0.01%     
==========================================
  Files          76       76              
  Lines        5401     5398       -3     
==========================================
- Hits         4852     4849       -3     
  Misses        549      549              

Flag	Coverage Δ
base	86.47% <100.00%> (-0.02%)	⬇️
core	89.65% <ø> (ø)
files	95.26% <ø> (ø)
komamri	88.32% <ø> (ø)
plots	90.88% <ø> (ø)

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Files with missing lines	Coverage Δ
...MRIBase/src/motion/actions/simpleactions/Rotate.jl	100.00% <100.00%> (ø)

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