add `AbstractProblemType`

[prbzrg]

Fixes #482

Checklist

• [ ] Appropriate tests were added
• [X] Any code changes were done in a way that does not break public API
• [no need?] All documentation related to code changes were updated
• [X] The new code follows the contributor guidelines, in particular the ScioML Style Guide and COLPRAC.
• [no need?] Any new documentation only uses public API

Additional context

lots of changes caused by applying JuliaFormatter.

[codecov[bot]]

Codecov Report

Attention: 29 lines in your changes are missing coverage. Please review.

Comparison is base (3db3a3a) 41.85% compared to head (54d33c0) 41.85%.

Files	Patch %	Lines
src/ensemble/basic_ensemble_solve.jl	23.52%	13 Missing :warning:
src/function_wrappers.jl	0.00%	6 Missing :warning:
src/problems/basic_problems.jl	50.00%	4 Missing :warning:
ext/SciMLBaseZygoteExt.jl	0.00%	3 Missing :warning:
src/problems/sde_problems.jl	0.00%	2 Missing :warning:
src/scimlfunctions.jl	80.00%	1 Missing :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #548 +/- ## ========================================== - Coverage 41.85% 41.85% -0.01% ========================================== Files 53 53 Lines 4155 4160 +5 ========================================== + Hits 1739 1741 +2 - Misses 2416 2419 +3 ```

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[prbzrg]

This PR got too much change and conflict.