Refactor: move the edit message from from `MessageActionsBox` to `Channel`

[szuperaz]

To implement the message bounce flow, we need to move the edit message form up in the component tree: from MessageActionsBox to Channel.

Part of this issue the edit message form is now extracted into a separate component: EditMessageForm -> it's now also possible to pass a custom template for this UI

The refactor also makes it possible for integrators to create a custom UI where users can edit a message inside the message input component (common UX pattern for chat apps) -> this still requires custom code, but at least it's possible.

With this isEditingChangeHandler is now removed from the MessageActionsBoxContext -> you need to update your custom code if you have used a custom component for this previously.

[github-actions]

🎉 This issue has been resolved in version 4.60.0 🎉

The release is available on:

• npm package (@latest dist-tag)
• GitHub release

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