Filter functionality improvements

[undefined-box]

The search filter currently makes a new parameterized call to the API via the cryptocurrency id, causing this issues:

• Unnecessary API calls:
  the application already fetches all results, it should not be necessary to make a new call upon search if the intent is to filter them

• Can display only one result:
  The user must specify the exact id of the cryptocurrency to be recovered, so the filter cannot show more than one result at a time

This could be fixed by storing the total results in the app state and displaying filtered results if needed; since the data is managed locally, the application can easily manipulate it, for example allowing the user to show all results that contain a given substring.

I can submit a PR if this looks ok for you :)

[kepoCode]

Perfect!