feat(misc): add streaming text and events notebook

Covers all streaming patterns for the Anthropic API: basic text_stream
iteration, raw event-by-event processing (message_start through
message_stop), token usage from final event, stream.get_final_text(),
stop sequences, async streaming with AsyncAnthropic, progress indicator,
and interruption handling. Uses claude-haiku-4-5.

Author: RudrenduPaul