feat(internal-plugin-llm): llmrefactor - renamed disconnectLLM in channel

[shnaaz]

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https://jira-eng-gpk2.cisco.com/jira/browse/SPARK-827598

This pull request addresses

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by making the following changes

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renamed disconnectLLM in llm.ts to disconnect

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• Internal code refactor

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[chatgpt-codex-connector]

Preserve the channel disconnectLLM alias

Because this class is still exported as the package default, any direct LLMChannel consumer that still calls the pre-existing disconnectLLM() method will now get a runtime TypeError; the commit only updates LLMPlugin internals, so this is a breaking change for direct channel users. Please keep a small disconnectLLM() wrapper that delegates to the new disconnect() while allowing disconnect() to clear LLM-specific state.

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[marcin-bazyl]

this is fine, we can break the APIs for LLM