feat: support nested tuples of arrays as Caches

[gdalle]

Fixes #747

• Implement recursive_similar for nested (named) tuples of arrays
• Use or replicate it in every operator overloading backend when handling caches
• Modify cachified test scenarios so that they run on a named tuple by default

[codecov]

Codecov Report

Attention: Patch coverage is 90.24390% with 4 lines in your changes missing coverage. Please review.

Project coverage is 97.84%. Comparing base (e1d171f) to head (8a0c9fd).

Files with missing lines	Patch %	Lines
...Ext/DifferentiationInterfaceTestStaticArraysExt.jl	33.33%	2 Missing ⚠️
...fferentiationInterfaceTest/src/scenarios/modify.jl	84.61%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #748      +/-   ##
==========================================
- Coverage   97.89%   97.84%   -0.05%     
==========================================
  Files         128      128              
  Lines        7368     7383      +15     
==========================================
+ Hits         7213     7224      +11     
- Misses        155      159       +4     

Flag	Coverage Δ
DI	98.94% <100.00%> (+<0.01%)	⬆️
DIT	95.07% <80.00%> (-0.17%)	⬇️

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