[Feature] Forward EBITDA

[deeleeramone]

1. Why?:

   • Adding to the equity.estimates route.

2. What? (1-3 sentences or a bullet point list):

   • New route: obb.equity.estimates.forward_ebitda
   • Support for FMP and Intrinio

3. Impact:

   • Additional maintenance for new route and models.

4. Testing Done:

   • With/without symbol(s).
   • Unit & integration tests.

5. Reviewer Notes (optional):

   • Lookup by symbol does not work for all symbols from Intrinio, this is an issue on their side.