add String[X] types

[bkamins]

Fixes #85

CC @quinnj

[bkamins]

and @nalimilan

[codecov]

Codecov Report

Merging #87 (6891905) into main (31b603a) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##             main      #87   +/-   ##
=======================================
  Coverage   80.35%   80.35%           
=======================================
  Files           3        3           
  Lines         962      962           
=======================================
  Hits          773      773           
  Misses        189      189           

Impacted Files	Coverage Δ
src/inlinestrings.jl	88.76% <ø> (ø)

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[quinnj]

Thanks!