feat(react): Export new option `setCustomTagNameTransformer`

[sdvg]

The option allows to provide a function at runtime that modifies the tag names to be rendered by the React proxy components.

Pull request checklist

Please check if your PR fulfills the following requirements:

• [x] Tests for the changes have been added (for bug fixes / features)
• [ ] Docs have been reviewed and added / updated if needed (for bug fixes / features)
• [x] Build (npm run build) was run locally for affected output targets
• [x] Tests (npm test) were run locally and passed
• [x] Prettier (npm run prettier) was run locally and passed

Pull request type

Please check the type of change your PR introduces:

• [ ] Bugfix
• [x] Feature
• [ ] Code style update (formatting, renaming)
• [ ] Refactoring (no functional changes, no api changes)
• [ ] Build related changes
• [ ] Documentation content changes
• [ ] Other (please describe):

What is the current behavior?

Issue URL: https://github.com/ionic-team/stencil-ds-output-targets/issues/420

What is the new behavior?

• Export method setCustomTagNameTransformer.
• When defined, run function customTagNameTransformer to modify tag names to be rendered.

Does this introduce a breaking change?

• [ ] Yes
• [x] No

Other information

This is just an early draft to show the idea and gather some feedback. Please let me know if this feature is something you'd like to merge and whether the general direction of the implementations is correct.