Enhance Sudoku seed generation for smaller puzzle sizes

[teogor]

Changes:

• FourDigitsSeeds, NineDigitsSeeds, SixteenDigitsSeeds:
  • Implemented new patterns and algorithms specifically designed to improve variety and quality of seeds for smaller puzzle sizes.
  • Increased the number of generated seeds to enhance diversity.
• TwentyFiveDigitsSeeds (New):
  • Introduced a new seed type for 5x5 Sudoku puzzles.
  • Developed unique patterns and algorithms tailored to the specific challenges of 5x5 grids.
  • Initial implementation focused on balancing difficulty and solvability.