This commit adds a `context` argument to the completion handlers in `PromptsTab`, `ResourcesTab`, `useCompletionState`, and `useConnection`.
The context argument allows passing additional information to the completion engine, which can be used to improve the quality of the completions. The context is passed as a dictionary of key-value pairs.
The `ResourcesTab` component was also updated to pass `templateValues` as the `context` to the completion handler.
The `useConnection` hook was updated to include the context in the completion request sent to the server.
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