Adds 88. Merge Sorted Array's solution and further improvements

[mathusanm6]

This pull request introduces the solution for the "Merge Sorted Array" problem in both Python and C++, adds corresponding test cases, and updates repository metadata and statistics. It also standardizes type annotations in several Python files to use built-in generics, and includes minor cleanup in test files.

Addition of "Merge Sorted Array" problem:

• Added new directory problems/merge_sorted_array with the following:
  • Python solution in merge_sorted_array.py implementing in-place merging.
  • C++ solution in merge_sorted_array.cc and header in merge_sorted_array.h. [1] [2]
  • Problem metadata in config.yml.
  • Test cases for both Python and C++ solutions. [1] [2]

Repository metadata and documentation updates:

• Updated .python-version to Python 3.14.8.
• Updated solution counts and added the new problem to the main table in README.md. [1] [2]

Standardization and cleanup of Python type annotations:

• Replaced typing.List and similar imports with built-in generics (e.g., list[int], list[str]) in problem solution files:
  • brace_expansion.py, calculate_amount_paid_in_taxes.py, contains_duplicate.py, evaluate_division.py, group_anagrams.py, minimum_flips_in_binary_tree_to_get_result.py. [1] [2] [3] [4] [5] [6]

Minor test and import cleanups:

• Removed unused imports and adjusted import order in several test files for consistency:
  • brace_expansion_test.py, calculate_amount_paid_in_taxes_test.py, contains_duplicate_test.py, evaluate_division_test.py, group_anagrams_test.py, minimum_flips_in_binary_tree_to_get_result_test.py. [1] [2] [3] [4] [5] [6]

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Copilot review overview

🟡 Changes recommended

Fix the failing test import path setup and handle malformed YAML shapes in README generation.

Review effort: Lite
Findings: 1 · 1

Open (2)

• Add repository root to sys.path before importing solution · New
• Handle malformed YAML configs without aborting README generation · New