Moved optstats to SciMLBase

[Vaibhavdixit02]

Checklist

• [ ] Appropriate tests were added
• [ ] Any code changes were done in a way that does not break public API
• [ ] All documentation related to code changes were updated
• [ ] The new code follows the contributor guidelines, in particular the SciML Style Guide and COLPRAC.
• [ ] 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 (24e9a11) 0.00% compared to head (54f11bd) 8.78%.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #681 +/- ## ========================================= + Coverage 0.00% 8.78% +8.78% ========================================= Files 12 31 +19 Lines 1119 2516 +1397 ========================================= + Hits 0 221 +221 - Misses 1119 2295 +1176 ```

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[ChrisRackauckas]

Bump the lower bound of SciMLBase in the Package.toml as well.