[Tech] Sync completed with main

Completed Sync

…lution_to_exercise/completed

Gp 26 add compleated solution to exercise/completed

…into_exercise/completed

Gp 31 migrate java oop into exercise/completed

…er_into_exercise/completed

Gp 28 migrate file reader into exercise/completed

…exercise/complited

Gp 32 merge stack into exercise/completed

added decrement of size when removing element

* GP-155: add solution to random-field-comparator exercise

# Conflicts:
#	2-0-data-structures-and-algorithms/2-2-4-linked-list/src/test/java/com/bobocode/cs/LinkedListTest.java
#	3-0-java-core/3-6-4-random-field-comparator/README.MD
#	3-0-java-core/3-6-4-random-field-comparator/src/main/java/com/bobocode/se/RandomFieldComparator.java
#	3-0-java-core/3-6-4-random-field-comparator/src/test/java/com/bobocode/se/RandomFieldComparatorTest.java

* complete comparing and thenComparing method

Gp 165 rename hash table

# Conflicts:
#	1-0-java-basics/1-3-2-heterogeneous-max-holder/src/main/java/com/bobocode/basics/HeterogeneousMaxHolder.java

Update CrazyOptionals.java