Add distance between two points algorithm (#7218)

* Add distance between two points algorithm

* Create DistanceBetweenTwoPointsTest.java

* DistanceBetweenTwoPoints.java

* Fix test file package and project structure

* Delete src/test/java/com/thealgorithms/DistanceBetweenTwoPointsTest.java

* Apply clang-format compliant formatting

* Apply clang-format

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Co-authored-by: a <19151554+alxkm@users.noreply.github.com>