Totals for tasks page

[bryceadams]

It would be really helpful to see the total at the top of the tasks page, perhaps below the filters but above the table.

This value is in the API response already so would not impact performance.

[emeraldhycient]

This is my first open source contribution and i would love to start with something really basic. Since the data is in the api, i can simplify render the value next to the "task" on the top bar and also add handling for thousands (k), millions (m) etc.