fix: conversion of solutions to DataFrames

[AayushSabharwal]

Checklist

• [x] Appropriate tests were added
• [x] Any code changes were done in a way that does not break public API
• [x] All documentation related to code changes were updated
• [x] The new code follows the contributor guidelines, in particular the SciML Style Guide and COLPRAC.
• [x] Any new documentation only uses public API

Additional context

Add any other context about the problem here.

[codecov[bot]]

Codecov Report

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

Comparison is base (3bfb948) 26.38% compared to head (0874d61) 5.26%.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #570 +/- ## ========================================== - Coverage 26.38% 5.26% -21.12% ========================================== Files 53 53 Lines 4089 4061 -28 ========================================== - Hits 1079 214 -865 - Misses 3010 3847 +837 ```

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