[chart.js] Export plugin registration types (#33614)
[chart.js] Export plugin registration types (#33614)

* Export plugin registration types

Export the types `PluginServiceGlobalRegistration` and `PluginServiceRegistrationOptions` since they are publicly visible to the user.

* Update index.d.ts

* Update index.d.ts

* Update index.d.ts

* Update index.d.ts

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