Feature Request: Support for LLM analytics with the Ruby SDK

Feature request

Is your feature request related to a problem?

Supporting LLM analytics natively with the Ruby SDK can simplify implementations for users of frameworks like RubyLLM. Currently, they have to use manual capture.

Describe the solution you'd like

Native LLM analytics integration in the Ruby SDK.

Describe alternatives you've considered

Using manual capture.

Additional context

From: https://posthoghelp.zendesk.com/agent/tickets/36785 (moved to PostHog: https://us.posthog.com/project/2/support/tickets/38229)

Debug info

Kind: support

Target area: sdk

Report event: http://go/ticketByUUID/d8878045-ad91-449d-be40-5a73b3034882

Session: https://us.posthog.com/project/sTMFPsFhdP1Ssg/replay/0198eb67-e77e-7ed0-951f-4c734901a576?t=342

Exceptions: https://us.posthog.com/project/2/error_tracking?filterGroup=%7B%22type%22%3A%22AND%22%2C%22values%22%3A%5B%7B%22type%22%3A%22AND%22%2C%22values%22%3A%5B%7B%22key%22%3A%22%24session_id%22%2C%22value%22%3A%5B%220198eb67-e77e-7ed0-951f-4c734901a576%22%5D%2C%22operator%22%3A%22exact%22%2C%22type%22%3A%22event%22%7D%5D%7D%5D%7D

Location: https://us.posthog.com/project/163120/llm-analytics

Persons-on-events mode for project: person_id_override_properties_on_events

Review the Ruby SDK context, the RubyLLM integration use case, and the linked manual-capture documentation. Clarify which LLM analytics capabilities and SDK API are required before implementation. Done means Ruby users can use native LLM analytics instead of manual capture, with the supported scope agreed.