Enable copy & paste in restricted editing mode

[jodator]

📝 Provide a description of the new feature

Pasting is disabled in restricted editing mode MVP. To further enhance this feature we should allow pasting inside non-restricted areas.

The minimal setup would be to strip block content from pasted data but probably we should also think about filtering out content that is not allowed in the restricted areas.

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[jodator]

We should have an additional configuration for the text attributes inside clipboard holder in the restricted editing mode. Depending on how we're gonna solve this I can see that we could ditch command toggling for some features (ie. "bold" feature commands might depend on schema)

User would define which attributes are allowed (config: restrictedEditing.allowedAttributes) and the RE feature would add a dynamic schema check and enable some attributes for given nodes.

We have to leave commands enabling since some commands might be enabled in restricted editing mode.