Enable crypto data fetching script to run as a multi-threaded process

Currently the **crypto data fetching** script works on a single process. You need to use python's [threading](https://docs.python.org/3/library/threading.html) module to create a new thread.

The script will now include a function which takes in `coin_name`, `currency_name`, `delay_time` and `number_of_threads` as arguments, and it will start as many threads as represented by the `number_of_threads` argument.

make sure that if this function is called again, it will stop all of the previously running threads and start new ones with new arguments.

Start with the crypto data fetching script and review its current single-process flow alongside Python's threading documentation. Verify the new function accepts coin_name, currency_name, delay_time, and number_of_threads, starts the requested number of threads, and stops previous threads when called again with new arguments.

Written by the indexing model from the issue text.