Added support for posthog identity api

[amirzak]

Add User Identification to PostHog Integration

Overview

This PR adds user identification capabilities to the PostHog integration, allowing for better user tracking and analytics by sending authenticated user data to PostHog.

Changes

• Added user identification logic to append user data after PostHog initialization
• Sends user ID, name, email, and avatar URL to PostHog when available
• Added identifyUsers configuration option to control the feature
• Updated manifest to include new configuration option

Documentation

The integration will now identify users in PostHog when enabled, allowing for:

• User-specific analytics and tracking
• Better understanding of user behavior
• Cross-session user tracking
• Enhanced segmentation capabilities

Related Issues

Closes #809

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Latest commit: 293cc2ab3b5b5bdba9c56719c6711212fa353c25

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