[Feature] Delay/Optimize Imports

[deeleeramone]

1. Why?:

   • This PR cleans up imports to not run on load, improving load and build time.

2. What?:

   • Remove imports of whole modules, only import the items required.
   • Moves non-definition imports to within functions that prevent the import from happening until the code is run.
   • Modifies Package Builder to accept a ForwardRef in "DataProcessingSupportedTypes", and replace with the actual import. The same way it was already done, just replacing "ForwardRef('DataFrame')" with 'DataFrame'

3. Impact:

   • Faster import times.

   • There should be no change, from a user's perspective, in operation.

   • Fundamentally changes the code style to incorporate this pattern.

4. Testing Done:

   • Lots of files manually changed, so there is potential for error.
   • WIP

Before:

After:

5. Additional Info:

   • The CI tests are being held up by, Security updates #6531, which is because finvizfinance dropped Python 3.8 support and the OpenBB lock files have not been updated in this PR to reflect our dropping of 3.8
   • Test cassettes have been recaptured. I have found one failure, historical_dividends from yFinance; this is broken both in the yFinance package and also directly on the Yahoo Finance website.

[deeleeramone]

how much does the decrease in import time affect our execution time? If there is a trade-off, is it one we're willing to make?

It only increases time for execution when the imports have not been done yet. Differences should be negligible.