Add datetime checker

[vvval]

• Add datetime checker

[codecov]

Codecov Report

Merging #5 into master will decrease coverage by 0.71%.
The diff coverage is 93.4%.

@@             Coverage Diff              @@
##             master       #5      +/-   ##
============================================
- Coverage     96.14%   95.42%   -0.72%     
- Complexity      219      255      +36     
============================================
  Files            22       23       +1     
  Lines           415      481      +66     
============================================
+ Hits            399      459      +60     
- Misses           16       22       +6

Impacted Files	Coverage Δ	Complexity Δ
src/AbstractChecker.php	94.11% <100%> (ø)	6 <0> (ø)	⬇️
src/Checker/FileChecker.php	100% <100%> (ø)	8 <0> (ø)	⬇️
src/Checker/TypeChecker.php	100% <100%> (ø)	9 <0> (ø)	⬇️
src/Condition/WithAllCondition.php	100% <100%> (ø)	3 <0> (ø)	⬇️
src/Condition/WithAnyCondition.php	100% <100%> (ø)	3 <0> (ø)	⬇️
src/Checker/AddressChecker.php	100% <100%> (ø)	16 <0> (ø)	⬇️
src/Config/ValidatorConfig.php	100% <100%> (ø)	18 <0> (ø)	⬇️
src/Checker/StringChecker.php	100% <100%> (ø)	11 <0> (ø)	⬇️
src/Validator.php	80% <100%> (ø)	23 <0> (-1)	⬇️
src/Checker/Traits/NotEmptyTrait.php	100% <100%> (ø)	4 <0> (ø)	⬇️
... and 7 more

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