feature: add ability to export coin data

[Zidious]

Why?

Gives the user the ability to create charts or consume the data in some other cool way

How?

new flag --export which will allow the user to export in two possible formats (we can add more later) csv and json.

Requirements:

1. User must supply at least one option
   1a. csv
   1b. JSON
2. User can supply both csv and JSON
   2a. should export coin data as csv and JSON
3. The filename should follow the below format:
   3a. <coin-name>-<timestamp>.<file-ext> example: bitcoin-2022-08-11T01-24:19.262Z.json

☝️ unit tests should be based on these scenarios