Paper only `player changes framed <item>` event (#2615)
* `player changes framed <item>` event
* Slightly update meta
* Use `frame` variable instead of getting it from `event`.
* Make fields `public` and store `ItemTag` as a field as well.
* Update field
* Update `ElementTag` constructor and de-cache `item` for `getContext`
* Fix typo
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commit: 9325f13)
