Apply some of the greptile recommendations

[haacked]

Just a bit of code cleanup.

[greptile-apps]

PR Summary

This PR focuses on improving logging infrastructure and error handling across the PostHog .NET client, with emphasis on type safety and maintainability.

• Added centralized GeneralLoggingExtensions.cs for shared logging functionality with source-generated methods
• Changed logger types to use strongly-typed ILogger<T> instead of generic ILogger for better type safety and context
• Improved error handling around JSON deserialization with specific exception handling for JsonException
• Made JsonAssert class internal to restrict visibility within assembly
• Updated XML documentation and type safety by changing Attr from object to string? in error responses

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