Add type annotations and typed_pos_args to the keyval module

[dcbaker]

No description provided.

[codecov]

Codecov Report

Merging #9623 (e38c4de) into master (bd9d981) will increase coverage by 0.00%.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##           master    #9623   +/-   ##
=======================================
  Coverage   67.39%   67.39%           
=======================================
  Files         402      402           
  Lines       85490    85490           
  Branches    17628    17626    -2     
=======================================
+ Hits        57615    57620    +5     
+ Misses      23266    23263    -3     
+ Partials     4609     4607    -2     

Impacted Files	Coverage Δ
mesonbuild/modules/keyval.py	95.23% <100.00%> (+4.54%)	⬆️
mesonbuild/scripts/vcstagger.py	87.50% <0.00%> (-4.17%)	⬇️
mesonbuild/msubprojects.py	55.91% <0.00%> (+0.40%)	⬆️
modules/keyval.py	95.23% <0.00%> (+4.99%)	⬆️

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