Add ability to combine onlyMethods and addMethod

[bikalbasnet]

Related Issue: one of the issue from #3911
Re Open of PR #3907

This PR gives the ability to combine two new methods onlyMethods and addMethods
so we can write UTs like this

$this->getMockBuilder(SomeClass::class)
    ->onlyMethods(['aMethodThatExists'])
    ->addMethods(['aMethodThatDoesNotExist']);

[codecov]

Codecov Report

Merging #3920 into master will increase coverage by 0.21%.
The diff coverage is 100%.

@@             Coverage Diff              @@
##             master    #3920      +/-   ##
============================================
+ Coverage     83.72%   83.94%   +0.21%     
- Complexity     3856     3909      +53     
============================================
  Files           151      151              
  Lines         10218    10369     +151     
============================================
+ Hits           8555     8704     +149     
- Misses         1663     1665       +2

Impacted Files	Coverage Δ	Complexity Δ
src/Framework/MockObject/MockBuilder.php	61.11% <100%> (-2.76%)	36 <3> (ø)
src/Framework/MockObject/Generator.php	83.93% <100%> (ø)	145 <10> (ø)	⬇️
src/TextUI/Help.php	100% <0%> (ø)	50% <0%> (+25%)	⬆️
src/Runner/PhptTestCase.php	83.6% <0%> (+0.65%)	109% <0%> (ø)	⬇️
src/Framework/TestSuite.php	78.54% <0%> (+2.29%)	130% <0%> (+15%)	⬆️
src/Util/Log/JUnit.php	94.11% <0%> (+3.79%)	47% <0%> (+13%)	⬆️

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