[IMPROVE] Add TQDM/Progress bar on tickers fetched

[sword134]

So far the TQDM/Progress Bar only shows the progress as 0/3 due to it being applied on a list of the 3 different financial statements. Wouldnt it be more appropriate to apply it on the loop that fetchesthe data for each individual ticker instead? That way you actually get a feeling for how far into the process it actually is.

An example being wrapping ticker_list_iterator in tqdm() at line 148 in fundamentals_model.py

[JerBouma]

I get it but it is a bit trickier to implement. For example, a somewhat similar result you wish to see can be achieved by calling the financial statement functions separately.

Feel free to open a PR though!