Catch and log all exceptions

[haacked]

And just debug assert that they're not "coding error" exceptions.

We don't want to miss out on exception logging in our async batching that could cause the process to crash without good info.

And bump version to 1.0.4.

[greptile-apps]

PR Summary

Enhanced exception handling in AsyncBatchHandler to catch and log all unexpected exceptions while maintaining debug assertions for coding errors, along with version bump to 1.0.4.

• Added general exception handling in src/PostHog/Library/AsyncBatchHandler.cs with Debug.Assert checks for ArgumentException and NullReferenceException
• Improved logging for unexpected exceptions in HandleFlushSignal, HandleTimer, and DisposeAsync methods
• Removed duplicate Nullable property declaration in Directory.Build.props
• Updated version from 1.0.3 to 1.0.4 across configuration files

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