Fix psalm errors + Improve type hints + Add support of object arrays to IterableDataReader

[vjik]

Q	A
Is bugfix?	✔️
New feature?	✔️
Breaks BC?	✔️
Fixed issues	#107

• fixed psalm errors
• in with* methods change return type hint from self to static
• add support of object arrays to IterableDataReader

[codecov]

Codecov Report

Base: 99.35% // Head: 99.19% // Decreases project coverage by -0.16% ⚠️

Coverage data is based on head (52bdb1d) compared to base (d7acb58).
Patch coverage: 96.29% of modified lines in pull request are covered.

Additional details and impacted files

@@             Coverage Diff              @@
##             master     #113      +/-   ##
============================================
- Coverage     99.35%   99.19%   -0.17%     
+ Complexity      258      254       -4     
============================================
  Files            35       36       +1     
  Lines           622      619       -3     
============================================
- Hits            618      614       -4     
- Misses            4        5       +1     

Impacted Files	Coverage Δ
src/Paginator/OffsetPaginator.php	97.33% <ø> (ø)
src/Reader/Filter/GroupFilter.php	100.00% <ø> (ø)
.../Iterable/Processor/IterableProcessorInterface.php	0.00% <0.00%> (ø)
src/Paginator/KeysetPaginator.php	100.00% <100.00%> (ø)
src/Reader/Iterable/IterableDataReader.php	98.03% <100.00%> (ø)
src/Reader/Iterable/Processor/Between.php	100.00% <100.00%> (ø)
src/Reader/Iterable/Processor/CompareProcessor.php	100.00% <100.00%> (ø)
src/Reader/Iterable/Processor/EqualsEmpty.php	100.00% <100.00%> (ø)
src/Reader/Iterable/Processor/EqualsNull.php	100.00% <100.00%> (ø)
src/Reader/Iterable/Processor/GroupProcessor.php	100.00% <100.00%> (ø)
... and 1 more

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