Replace Platform.Numbers library with .NET 8 generic math

[konard]

Summary

This PR implements issue #46 by replacing the Platform.Numbers library with .NET 8 generic math capabilities.

Changes Made

• Replaced Platform.Numbers.Arithmetic.Increment with .NET 8 generic math operators (+= with TLinkAddress.One)
• Updated generic constraints to use INumber<TLinkAddress> instead of just struct
• Updated imports to use System.Numerics instead of Platform.Numbers
• Applied changes to all relevant classes:
  • DefaultJsonStorage<TLinkAddress>
  • JsonImporterCli<TLinkAddress>
  • JsonExporterCli<TLinkAddress>

Breaking Changes

• Version bumped to 0.2.0 due to breaking changes in generic constraints
• Classes using DefaultJsonStorage now require TLinkAddress types that implement INumber<TLinkAddress>
• This is compatible with standard numeric types (uint, ulong, etc.) used in the platform

Benefits

• Reduced dependency footprint - No longer directly depends on Platform.Numbers
• Better performance - Uses optimized .NET generic math operations
• Future-proof - Leverages modern .NET features
• Type safety - Stronger compile-time guarantees for numeric operations

Testing

• All projects build successfully
• No breaking changes for existing usage with standard numeric types
• Platform.Numbers is still available transitively from other dependencies if needed

Fixes #46

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