v2.0.0 - .NET 10, bug fixes, modernized tests

Breaking changes:
- Target framework upgraded to .NET 10.0 (was .NET Core 2.0)
- DLinkedList.InsertAfter now correctly inserts after index (was before)
- SkipList sentinel bugs fixed (Contains/Remove behavior changed)
- BellmanFord iteration count fixed (V-1 iterations, was V-2)

New features:
- OpenScatterHashTable fully implemented

Bug fixes:
- ChainedHashTable.CopyTo index bug
- SkipList level generation (always >= 1)
- BinomialMinHeap size tracking
- Multiple algorithm correctness fixes

Other:
- Modernized test suite with xUnit best practices
- Updated all dependencies to latest versions
- CI/CD workflow improvements

Merge pull request #114 from nickntg/nuget

Nuget command for Windows