Additional Pylint fixes

[avylove]

Hopefully this takes care of the rest of the issues.

• Added type hints for _time_left(), _read_until, and DEFAULT_ESCDELAY in keyboard.pyi
• Removed functools.partial() in Terminal.inkey()
  • Pylint complained about no return value
  • It doesn't seem necessary anymore. I think at one point it consolidated some complicated code, but now these calls are pretty simple
• Ignore two cases where Pylint reported a false positive

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 95.41%. Comparing base (e904de3) to head (f7b3651).

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #268      +/-   ##
==========================================
- Coverage   95.42%   95.41%   -0.01%     
==========================================
  Files           9        9              
  Lines        1027     1025       -2     
  Branches      216      216              
==========================================
- Hits          980      978       -2     
  Misses         43       43              
  Partials        4        4              

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[jquast]

thanks!