🔧 Add typing to Scanner

[Alunderin]

Changes state_inline.Scanner into a typing.NamedTuple instead of a collections.namedtuple. They should be functionally equivalent except that the former has typing for its members while the latter does not.

I tend to use strict type checking for my own projects so it'd be nice if Pyright didn't freak out when I try to access the result of scanDelims without using typing.cast.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 95.80%. Comparing base (2f6ae10) to head (de1fb4b).
⚠️ Report is 1 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #382   +/-   ##
=======================================
  Coverage   95.80%   95.80%           
=======================================
  Files          64       64           
  Lines        3455     3457    +2     
=======================================
+ Hits         3310     3312    +2     
  Misses        145      145           

Flag	Coverage Δ
pytests	95.80% <100.00%> (+<0.01%)	⬆️

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[chrisjsewell]

cheers!