Refactored LIKE operator; added comparison tests

[codecov-io]

Codecov Report

Merging #200 into master will increase coverage by 0.05%. The diff coverage is 100%.

@@            Coverage Diff             @@
##           master     #200      +/-   ##
==========================================
+ Coverage   95.49%   95.55%   +0.05%     
==========================================
  Files        1142     1144       +2     
  Lines       55361    55526     +165     
  Branches     2967     2974       +7     
==========================================
+ Hits        52868    53058     +190     
+ Misses       2487     2462      -25     
  Partials        6        6

Impacted Files	Coverage Δ
src/expr-library/string/escape-like-pattern.ts	100% <100%> (ø)	:arrow_up:
src/expr-library/string/not-like.ts	100% <100%> (ø)	:arrow_up:
src/expr-library/string/like.ts	100% <100%> (ø)	:arrow_up:
src/expr-library/equation/index.ts	100% <100%> (ø)	:arrow_up:
src/operator-type.ts	100% <100%> (ø)	:arrow_up:
src/expr-library/equation/not-in-query.ts	93.47% <0%> (ø)
src/expr-library/equation/not-in-array.ts	100% <0%> (ø)
src/ast/sqlfier/not-implemented-sqlfier.ts	90.9% <0%> (+4.54%)	:arrow_up:
...brary/factory/make-comparison-projection-2-to-n.ts	100% <0%> (+36.7%)	:arrow_up:

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