feat: Export NameFunction type

[runeh]

Want to have the type available for libs consuming generate-runtypes

[codecov-commenter]

Codecov Report

Merging #123 (3a2c917) into main (1dba38f) will increase coverage by 20.00%.
The diff coverage is 100.00%.

@@             Coverage Diff              @@
##             main      #123       +/-   ##
============================================
+ Coverage   80.00%   100.00%   +20.00%     
============================================
  Files           2         2               
  Lines          35       255      +220     
  Branches        7        64       +57     
============================================
+ Hits           28       255      +227     
+ Misses          7         0        -7     

Impacted Files	Coverage Δ
src/main.ts	100.00% <100.00%> (+22.58%)	⬆️
src/util.ts	100.00% <100.00%> (ø)

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