Create non generic rules engine

[luispfgarces]

Description

Evolves the rules engine to a non-generic version by setting the content type and condition type to a string default. The library users can optionally use a generic rules engine wrapper specifying TContentType and TConditionType - as long as those types are either enum types or other types convertible to string and parseable from string.

[!WARNING] Breaking change on rules engine build-up. Current usages of the library will have to remove TContentType and TConditionType from builder methods and use and additional MakeGeneric<TContentType, TConditionType>() method to get a equivalent instance of RulesEngine<TContentType, TConditionType>.

[!WARNING] Additional APIs were added to create and get content types from the rules engine. From now on, the library users will be required to create explicitly the content types using the new API, except if the AutoCreateContentTypes option is true. This is a breaking change on behavior.

Change checklist

• [x] Code follows the code rules guidelines of this project
• [x] Commit messages follow the commit rules of this project
• [x] I have self-reviewed my changes before submitting this pull request
• [x] I have covered new/changed code with new tests and/or adjusted existent ones
• [ ] I have made changes necessary to update the documentation accordingly

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