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feat(config): allow to override resolve tsconfig behavior (#2063)

This change is needed because some jest transformers which want to reuse/extend our `ConfigSet` but want to change the default behavior when reading and resolving tsconfig. 

This PR introduces:
- Change `_readTsConfig` to `_resolveTsConfig` and set `_resolveTsConfig` to `protected`
- Allow to override `_resolveTsConfig` via overload signature
- Expose `_transformCfgStr`, `_configSet`, `_overriddenCompilerOptions`

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