refactor(themes): add an internal handler option to transform theme maps #13048
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Adding an internal callback to allow for customization of the theme name and selector (for now explicitly for Elements, see #12974 for more details).
Not sure if there are some tests I should update or add, can use some help on that one. Will also try to test if there's any meaningful perf impact.
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Checklist:
feature/README.MDupdates for the feature docsREADME.MDCHANGELOG.MDupdates for newly added functionalityng updatemigrations for the breaking changes (migrations guidelines)