[BugFix] TensorDict comparison

[vmoens]

Description

Makes TensorDict comparison fault-tolerant

[codecov]

Codecov Report

Merging #567 (19fec0e) into main (341b3ab) will increase coverage by 0.01%.
The diff coverage is 90.90%.

@@            Coverage Diff             @@
##             main     #567      +/-   ##
==========================================
+ Coverage   86.88%   86.90%   +0.01%     
==========================================
  Files         121      121              
  Lines       21786    21802      +16     
==========================================
+ Hits        18929    18946      +17     
+ Misses       2857     2856       -1     

Flag	Coverage Δ
linux-cpu	85.23% <90.90%> (+0.01%)	⬆️
linux-gpu	86.68% <90.90%> (+0.01%)	⬆️
linux-outdeps-gpu	75.44% <90.90%> (+0.05%)	⬆️
linux-stable-cpu	85.21% <90.90%> (+0.01%)	⬆️
linux-stable-gpu	86.68% <90.90%> (+0.01%)	⬆️
macos-cpu	84.99% <90.90%> (+0.01%)	⬆️

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Impacted Files	Coverage Δ
torchrl/data/tensordict/tensordict.py	82.50% <75.00%> (+0.03%)	⬆️
test/test_tensordict.py	97.44% <100.00%> (+0.02%)	⬆️
torchrl/data/tensordict/memmap.py	85.76% <100.00%> (+0.36%)	⬆️

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