api: add mul interp mode

[mloubout]

• Add a mode for symmetric interpolation (sometime needed for better stability)
• Added notebook on interp/staggered
• Added lots of tests for it

[codecov]

Codecov Report

❌ Patch coverage is 99.22481% with 2 lines in your changes missing coverage. Please review.
✅ Project coverage is 83.43%. Comparing base (91d8596) to head (be046cb).

Files with missing lines	Patch %	Lines
devito/finite_differences/differentiable.py	95.65%	1 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2788      +/-   ##
==========================================
+ Coverage   83.35%   83.43%   +0.08%     
==========================================
  Files         248      248              
  Lines       51734    51966     +232     
  Branches     4463     4476      +13     
==========================================
+ Hits        43122    43357     +235     
+ Misses       7859     7856       -3     
  Partials      753      753              

Flag	Coverage Δ
pytest-gpu-aomp-amdgpuX	68.67% <57.53%> (-0.04%)	⬇️
pytest-gpu-gcc-	78.14% <99.22%> (+0.10%)	⬆️
pytest-gpu-icx-	78.07% <99.22%> (+0.11%)	⬆️
pytest-gpu-nvc-nvidiaX	69.20% <57.53%> (-0.02%)	⬇️

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