Add unit tests for the "How Many Numbers Are Smaller Than the Current Number" problem.

[kobukuro]

No description provided.

[Copilot]

Pull request overview

This PR refactors the "How Many Numbers Are Smaller Than the Current Number" (LeetCode 1365) solution and adds comprehensive unit tests. The main solution file is moved from the root src/ directory to the proper package structure src/main/java/com/leetcode/easy/, and JUnit tests are added following established codebase conventions.

Changes:

• Moved solution from src/HowManyNumbersAreSmallerThanTheCurrentNumber1365.java to proper package structure
• Added comprehensive documentation including time and space complexity analysis
• Removed main method and unused imports from the solution
• Added unit tests covering three example cases including duplicates and edge cases

Reviewed changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated no comments.

File	Description
src/main/java/com/leetcode/easy/HowManyNumbersAreSmallerThanTheCurrentNumber1365.java	Refactored solution with proper package structure, added detailed complexity documentation
src/test/java/com/leetcode/easy/HowManyNumbersAreSmallerThanTheCurrentNumber1365Test.java	Added unit tests covering typical cases, duplicates, and identical elements
src/HowManyNumbersAreSmallerThanTheCurrentNumber1365.java	Removed old file from incorrect location

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