Add toBeDateString matcher

[idan-at]

Added a new matcher to check whether a string is in a date format.

A use-case example: when serializing a JS object with date values, those become strings, and when comparing against the returned json, it can be useful to use this matcher.

Housekeeping

• Unit tests
• Documentation is up to date
• No additional lint warnings
• Typescript definitions are added/updated where relevant

[bompus]

This is likely a dupe of #164 and would be super useful.

[codecov]

Codecov Report

Merging #252 (a35a4a7) into main (5d16552) will increase coverage by 100.00%.
The diff coverage is 100.00%.

❗ Current head a35a4a7 differs from pull request most recent head 34489be. Consider uploading reports for the commit 34489be to get more accurate results

@@             Coverage Diff             @@
##           main      #252        +/-   ##
===========================================
+ Coverage      0   100.00%   +100.00%     
===========================================
  Files         0       111       +111     
  Lines         0       563       +563     
  Branches      0        98        +98     
===========================================
+ Hits          0       563       +563     

Impacted Files	Coverage Δ
src/matchers/toBeDateString/index.js	100.00% <100.00%> (ø)
src/matchers/toBeDateString/predicate.js	100.00% <100.00%> (ø)
src/matchers/toContainAnyKeys/index.js	100.00% <0.00%> (ø)
src/matchers/toBeTrue/predicate.js	100.00% <0.00%> (ø)
src/matchers/toBeString/predicate.js	100.00% <0.00%> (ø)
src/matchers/toContainValue/index.js	100.00% <0.00%> (ø)
src/matchers/toBePositive/index.js	100.00% <0.00%> (ø)
src/matchers/toBeBefore/predicate.js	100.00% <0.00%> (ø)
src/matchers/toContainKeys/index.js	100.00% <0.00%> (ø)
src/matchers/toSatisfyAll/predicate.js	100.00% <0.00%> (ø)
... and 101 more

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[SimenB]

thanks!