A step-counter app tracks your steps each day. A day meets the goal if its steps are greater than or equal to goal.
Task: write longest_streak(daily_steps, goal) that returns the length of the longest run of days in a row that all meet the goal.
0.Here the runs that meet the goal are 12000, 11000 (2 days) and 10500, 10000, 13000 (3 days). The longest is 3.