robust handling of fileno

[willmcgugan]

More robust handling of fileno() which is often implemented badly in proxies and wrappers.

Should fix #2645

[codecov-commenter]

Codecov Report

Base: 98.39% // Head: 98.39% // Increases project coverage by +0.00% 🎉

Coverage data is based on head (6925187) compared to base (379a38c).
Patch coverage: 100.00% of modified lines in pull request are covered.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #2678   +/-   ##
=======================================
  Coverage   98.39%   98.39%           
=======================================
  Files          63       64    +1     
  Lines        6796     6805    +9     
=======================================
+ Hits         6687     6696    +9     
  Misses        109      109           

Flag	Coverage Δ
unittests	98.39% <100.00%> (+<0.01%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
rich/spinner.py	100.00% <ø> (ø)
rich/_fileno.py	100.00% <100.00%> (ø)
rich/console.py	98.01% <100.00%> (-0.01%)	⬇️
rich/pretty.py	98.98% <100.00%> (ø)

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