Add Handler suffix to filter handlers

[samdark]

Q	A
Is bugfix?	❌
New feature?	❌
Breaks BC?	✔️
Fixed issues	#128

[what-the-diff]

• Rename all classes in src/Reader/Iterable/FilterHandler to end with Handler
• Update tests accordingly
• Rename AllTest.php to AllHandlerTest.php
• Replace all occurrences of "All" with "AllHandler".
• Replace all occurrences of Equals, GreaterThanOrEqual and LessThanOrEqual with their Handler counterparts (EqualsHandler etc).
• Rename classes to follow PSR-4 standard.
• Fix tests for renamed classes and methods.
• Rename LessThan to LessThanHandler
• Rename Like to LikeHandler
• Remove unused import in NotTest class (Equals) and replace it with EqualsHandler

[codecov]

Codecov Report

Base: 99.35% // Head: 99.35% // No change to project coverage 👍

Coverage data is based on head (dcab51f) compared to base (cc7bc93).
Patch coverage: 100.00% of modified lines in pull request are covered.

Additional details and impacted files

@@            Coverage Diff            @@
##             master     #131   +/-   ##
=========================================
  Coverage     99.35%   99.35%           
  Complexity      252      252           
=========================================
  Files            35       35           
  Lines           620      620           
=========================================
  Hits            616      616           
  Misses            4        4           

Impacted Files	Coverage Δ
src/Reader/Iterable/FilterHandler/AllHandler.php	100.00% <ø> (ø)
src/Reader/Iterable/FilterHandler/AnyHandler.php	100.00% <ø> (ø)
...c/Reader/Iterable/FilterHandler/BetweenHandler.php	100.00% <ø> (ø)
...c/Reader/Iterable/FilterHandler/CompareHandler.php	100.00% <ø> (ø)
...ader/Iterable/FilterHandler/EqualsEmptyHandler.php	100.00% <ø> (ø)
...rc/Reader/Iterable/FilterHandler/EqualsHandler.php	100.00% <ø> (ø)
...eader/Iterable/FilterHandler/EqualsNullHandler.php	100.00% <ø> (ø)
...ader/Iterable/FilterHandler/GreaterThanHandler.php	100.00% <ø> (ø)
...erable/FilterHandler/GreaterThanOrEqualHandler.php	100.00% <ø> (ø)
src/Reader/Iterable/FilterHandler/GroupHandler.php	100.00% <ø> (ø)
... and 6 more

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