Add BitString constructor with array of integers for 152x performance improvement

[konard]

Summary

• Add new BitString(long[] array, long length) constructor for efficient initialization from array of integers
• Add CreateWithRandomBits(long length) extension method using the new constructor
• Add comprehensive tests and benchmarks to verify correctness and performance

Performance Results

The new constructor provides 152x faster initialization compared to the existing SetRandomBits() method:

• Old method: 456ms for 100 iterations of 10,000 bit strings
• New method: 3ms for 100 iterations of 10,000 bit strings
• Improvement: 152x faster

Implementation Details

• New constructor accepts long[] array and validates it has sufficient elements for the requested bit length
• SetBordersFromArray() method efficiently calculates min/max positive word boundaries from the array data
• CreateWithRandomBits() generates random data at the word level instead of bit-by-bit
• All existing functionality remains unchanged and backward compatible

Testing

• Added unit tests verifying correctness of new constructor vs bit-by-bit initialization
• Added performance comparison test demonstrating significant speedup
• All existing tests continue to pass
• Added benchmark methods for performance measurement

Resolves #49

🤖 Generated with Claude Code