Add .soft.between and .soft.surroundedBy

[johnynek]

address the kinds of errors seen here:

#272 (comment)

[codecov-commenter]

Codecov Report

Merging #289 (88b9663) into main (eee5032) will increase coverage by 0.01%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main     #289      +/-   ##
==========================================
+ Coverage   96.36%   96.38%   +0.01%     
==========================================
  Files           8        8              
  Lines         991      995       +4     
  Branches       95       97       +2     
==========================================
+ Hits          955      959       +4     
  Misses         36       36              

Impacted Files	Coverage Δ
core/shared/src/main/scala/cats/parse/Parser.scala	96.29% <100.00%> (+0.01%)	⬆️

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[regadas]

👍 lgtm!