Rename Task Numbers

The tasks should renamed such that they are properly ordered in the repository. Right now, tasks numbers that are 3 digits long do not always appear before task numbers that are 4 digits long in the `tasks/` directory of the repository or when you type `ls` in this directory in the terminal.

To fix this, we should rename the task numbers be adding a 0 before the 3 digit long task numbers. For example, task 999 should be renamed from `task999_pib_translation_malayalam_tamil.json` to `task0999_pib_translation_malayalam_tamil.json`, so it appears right before `task1000_pib_translation_tamil_malayalam.json`. You can go through the `tasks/` directory to see many more examples of this issue.

If we plan to have over 10,000 tasks one day, then we should add two 0's before the 3 digit numbers and one 0 before the 4 digit numbers.