Doc: Add embedding api references

[dipinknair]

Add Embedding API references in Documentation

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 80.87%. Comparing base (bb5d4a6) to head (d30acd1).

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #758 +/- ## ========================================== - Coverage 81.68% 80.87% -0.81% ========================================== Files 32 32 Lines 1982 1982 ========================================== - Hits 1619 1603 -16 - Misses 363 379 +16 ```

[klmcadams]

@dipinknair I think we should implement sphinx-autoapi instead using ansys-sphinx-theme[autoapi]==0.16.5. Using autoapi should generate an API reference for all files in the src directory. I can help implement it if you want