Feature/Added support for key types on Collections.

[othercodes]

• Collection::typeOf renamed to Collection::valueType.
• Added Collection::keyType.
• Added invariant methods to check key types.

[codecov]

Codecov Report

Merging #12 (ec622c5) into main (3e97fe4) will increase coverage by 1.09%.
The diff coverage is 76.59%.

@@             Coverage Diff              @@
##               main      #12      +/-   ##
============================================
+ Coverage     82.81%   83.90%   +1.09%     
- Complexity      117      135      +18     
============================================
  Files            20       21       +1     
  Lines           256      292      +36     
============================================
+ Hits            212      245      +33     
- Misses           44       47       +3     

Flag	Coverage Δ	Complexity Δ
unittests	83.90% <76.59%> (?)	0.00 <24.00> (?)

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Impacted Files	Coverage Δ	Complexity Δ
src/Domain/ValueObjects/EnumValue.php	0.00% <0.00%> (ø)	8.00 <2.00> (+1.00)
src/Domain/ValueObjects/UUIDValue.php	84.61% <33.33%> (-15.39%)	7.00 <3.00> (+1.00)	⬇️
src/Domain/Collection.php	100.00% <100.00%> (ø)	16.00 <16.00> (?)
src/Domain/Criteria/Filter.php	100.00% <100.00%> (ø)	9.00 <3.00> (ø)
src/Domain/Traits/HasInvariants.php	100.00% <0.00%> (+4.16%)	9.00% <0.00%> (ø%)

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