bug: naming conflicts are not handled correctly

If a plugin were to use a type name that's being used by Capacitor itself already, this script will overwrite the type definition from the plugin by the definition from Capacitor. Take for example `SystemBarsVisibilityOptions`. If the community safe area plugin uses that name, the docgen will generate incorrect output for the safe area plugin, by overwriting the definition with [this one](https://github.com/ionic-team/capacitor/blob/196b642236d293a5012e3c307fcd942766e56cce/core/src/core-plugins.ts#L572)