feat: add some platform info to events

[pauldambra]

this isn't very useful in product analytics but would be super useful in error tracking

[greptile-apps]

PR Summary

This PR adds platform information to events captured by the PostHog Python client, enhancing error tracking capabilities with environmental context.

• Added get_os_info() function in /posthog/client.py that detects and standardizes OS name and version across Windows, macOS, Linux, FreeBSD, and other platforms
• Added system_context() function that returns Python runtime, Python version, OS name, and OS version information
• Modified the capture method to include system context in event properties
• Implemented platform-specific detection logic using sys.platform and platform module with fallbacks for different Python versions
• Added special handling for Linux distributions to extract version information from either deprecated platform.linux_distribution() or the newer distro module

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