v2.0.0 - .NET updates and API changes

Changed

• Updated SDK to .NET 10
• Updated RTM to .NET 8
• Upgraded dependecies and tools
• More performance optimizations in Core.fs
• More benchmarks covering more scenarios
• BREAK! Replaced AlphabetError with InvalidAlphabet
• BREAK! Code which previously raised TryMakeAlphabet now raises ArgumentOutOfRangeException
• Updated documentation (new styles, better search, up-to-date content)

Added

• NanoId.IsEmpty static method (analog to NanoId.isEmpty module function)
• TryMakeAlphabet extension method (on String), simplifies creation of custom alphabets
• |Letters| active pattern for extracting letters from Alphabet, InvalidAlphabet