Implement aliases

[brentyi]

Usage:

long_argument: Annotated[str, tyro.conf.arg(aliases=["-l", "--shorter"])]

Closes #54!

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (5907cd3) 99.22% compared to head (588423e) 99.22%.

Additional details and impacted files

@@           Coverage Diff           @@
##             main      #83   +/-   ##
=======================================
  Coverage   99.22%   99.22%           
=======================================
  Files          24       24           
  Lines        2061     2067    +6     
=======================================
+ Hits         2045     2051    +6     
  Misses         16       16           

Flag	Coverage Δ
unittests	99.22% <100.00%> (+<0.01%)	⬆️

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

Files	Coverage Δ
tyro/_arguments.py	100.00% <100.00%> (ø)
tyro/_fields.py	99.67% <100.00%> (+<0.01%)	⬆️
tyro/conf/_confstruct.py	100.00% <100.00%> (ø)

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