Fix: Reject pending commands if connection is closed (#52 by @clue)

Fix: Do not support multiple statements for security and API reasons (#51 by @clue)

Fix: Fix reading empty rows containing only empty string columns (#46 by @clue)

Fix: Report correct field length for fields longer than 16k chars (#42 by @clue)

Add quickstart example and interactive CLI example (#45 by @clue)