Prepare the 1.0.0 release

[haacked]

This bumps the version to 1.0.0 (removing the beta label).

It also adds some code documentation and changes the ctor for PostHogClient to accept nulls for each of the dependencies and provides a simple alternative when null.

[greptile-apps]

PR Summary

This PR prepares the PostHog .NET SDK for its first stable 1.0.0 release, marking it as production-ready.

• Version updated from 1.0.0-beta.12 to 1.0.0 in Directory.Build.props, though contains duplicate Nullable property and incorrect copyright year (2025)
• Modified PostHogClient constructor to handle null dependencies with sensible defaults, improving flexibility
• Added comprehensive XML documentation across multiple files to enhance API discoverability and usage clarity
• Changed PropertyFilterValueJsonConverter from public to internal sealed for better encapsulation
• Fixed potential issue in PostHogClient where timeProvider was used before null check in MemoryCache initialization

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