Cache getattr(); use a constant for cache size

[jwodder]

Closes #24.

[codecov[bot]]

Codecov Report

Merging #26 (e1b6ee6) into master (fc1a489) will increase coverage by 0.29%. The diff coverage is 70.00%.

@@            Coverage Diff             @@
##           master      #26      +/-   ##
==========================================
+ Coverage   67.40%   67.70%   +0.29%     
==========================================
  Files           8        9       +1     
  Lines         540      545       +5     
==========================================
+ Hits          364      369       +5     
  Misses        176      176              

Impacted Files	Coverage Δ
datalad_fuse/__init__.py	77.77% <0.00%> (ø)
datalad_fuse/consts.py	100.00% <100.00%> (ø)
datalad_fuse/fsspec.py	80.76% <100.00%> (+0.14%)	:arrow_up:
datalad_fuse/fuse_.py	26.77% <100.00%> (+1.22%)	:arrow_up:

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[yarikoptic]

Did you see any benefit from it eg on those use cases you tried before?

[jwodder]

@yarikoptic I don't think I ever noticed any benefits from the caching, but I also didn't do any timing comparisons.

[yarikoptic]

Let's see if real life, thanks!