[Feature] Add Historical Market Cap

[deeleeramone]

1. Why?:

   • Historical market cap is a different way to look at performance.
   • Quick win add that can be populated with other providers later.

2. What?:

   • New endpoint: obb.equity.historical_market_cap
   • New standard model.
   • One provider - FMP - others to follow later.
   • Multiple symbols allowed.
   • Chart included

3. Impact:

   • More stuff and things to maintain.

4. Testing Done:

   • One symbol, multiple symbols; start/end dates.
   • Chart
   • Unit/Integration

obb.equity.historical_market_cap("AAPL,msft,nvda", start_date="2024-01-01", chart=True).show()