Instacart parent Maplebear Inc. (NASDAQ:CART) reported its first-quarter financial results after the bell Wednesday. Here's a look at the key figures from the report.   The Details: Instacart reported quarterly earnings of 43 cents per share, which beat the analyst consensus estimate of a loss of 2 cents per share. Quarterly sales came in at $820 million, which beat the analyst consensus estimate of $793.44 million by 3.35%. Gross transaction value (GTV) was $8.319 billion, up 11% ...