Add Comparator for Strings

[pwsdotru]

Add one separate class for string compare

[codecov[bot]]

Codecov Report

Merging #84 into master will decrease coverage by 0.62%. The diff coverage is 90.90%.

@@             Coverage Diff              @@
##             master      #84      +/-   ##
============================================
- Coverage     99.30%   98.68%   -0.63%     
- Complexity      125      131       +6     
============================================
  Files            15       16       +1     
  Lines           288      304      +16     
============================================
+ Hits            286      300      +14     
- Misses            2        4       +2     

Impacted Files	Coverage Δ	Complexity Δ
src/StringComparator.php	89.47% <89.47%> (ø)	7.00 <7.00> (?)
src/Factory.php	95.00% <100.00%> (+0.12%)	15.00 <0.00> (ø)
src/ScalarComparator.php	100.00% <100.00%> (ø)	15.00 <0.00> (-1.00)

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[pwsdotru]

@sebastianbergmann can you please see this PR

I think it will good base for add canonicalize for string.

But need solve how calculate canonicalize.

[sebastianbergmann]

This branch has conflicts that must be resolved. Also, please explain what you want to achieve with this. So far, I do not see any benefit and am inclined to reject this pull request.

[pwsdotru]

@sebastianbergmann main idea was separtate comporator for scalar and string types. Because for string need make canonicalize comporators. Else need add condition like is_string and it code will not very clean