feat: add dataframe <-> OSTk object utilities

[codecov[bot]]

Codecov Report

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

Project coverage is 90.86%. Comparing base (7160108) to head (99394ad).

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #426 +/- ## ======================================= Coverage 90.86% 90.86% ======================================= Files 84 84 Lines 8323 8323 ======================================= Hits 7563 7563 Misses 760 760 ```

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