refactor: Merge fuzzy_search_mode and conversion_engine options

[codecov[bot]]

Codecov Report

Attention: Patch coverage is 98.88889% with 3 lines in your changes missing coverage. Please review.

Project coverage is 89.69%. Comparing base (dfe0e82) to head (8c59342).

Files	Patch %	Lines
capi/src/io.rs	76.92%	3 Missing :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #608 +/- ## ========================================== + Coverage 89.49% 89.69% +0.19% ========================================== Files 40 42 +2 Lines 8602 8710 +108 ========================================== + Hits 7698 7812 +114 + Misses 904 898 -6 ```

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