async_fetch 001: "Feat": edit function to be async for fetching data

[S0rushSotoudeh]

This type of task is time-consuming and would be better handled asynchronously. Before this change, the total fetch time was the sum of the fetch times for Bours and Fara Bourse. However, after this change, the total fetch time is now the maximum of the two times:
total fetch time=max(bourse fetch time,fara bourse fetch time)

This optimization can make the fetching process twice as fast as it was before.

For example:

ETA for Fara Bourse: 1.0372366905212402 seconds
ETA for Bours: 1.294360637664795 seconds
ETA for total: 1.294360637664795 seconds