Feature/configs for implicit models

[feldlime]

Description

• Added configs for implicit models

Type of change

• [ ] Bug fix (non-breaking change which fixes an issue)
• [x] New feature (non-breaking change which adds functionality)
• [ ] Breaking change (fix or feature that would cause existing functionality to not work as expected)
• [ ] Optimization

How Has This Been Tested?

Before submitting a PR, please check yourself against the following list. It would save us quite a lot of time.

• Have you read the contribution guide?
• Have you updated the relevant docstrings? We're using Numpy format, please double-check yourself
• Does your change require any new tests?
• Have you updated the changelog file?

[codecov[bot]]

Codecov Report

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

Please upload report for BASE (feature/model_configs@e682847). Learn more about missing BASE report.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## feature/model_configs #167 +/- ## ========================================================= Coverage ? 100.00% ========================================================= Files ? 56 Lines ? 3519 Branches ? 0 ========================================================= Hits ? 3519 Misses ? 0 Partials ? 0 ```

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