improve printing for homogenous arrays

[simeonschaub]

This came up on Slack. Makes arrays of InlineStrings a bit easier to
read.

[nickrobinson251]

Very nice! thanks, @simeonschaub

[codecov-commenter]

Codecov Report

Merging #63 (d7105ec) into main (9b4ff8f) will increase coverage by 0.02%.
The diff coverage is 100.00%.

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@@            Coverage Diff             @@
##             main      #63      +/-   ##
==========================================
+ Coverage   93.02%   93.04%   +0.02%     
==========================================
  Files           1        1              
  Lines         674      676       +2     
==========================================
+ Hits          627      629       +2     
  Misses         47       47              

Impacted Files	Coverage Δ
src/InlineStrings.jl	93.04% <100.00%> (+0.02%)	⬆️

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[nickrobinson251]

Before we had

julia> x = String31["foo", "bar"];

julia> println(x)
String31[String31("foo"), String31("bar")]

Now we have:

julia> println(x)
String31["foo", "bar"]

[quinnj]

Thanks @simeonschaub!