Remove image, embed, document, and link entities on paste if not enabled

[inostia]

Description
This PR includes a call to an additional function normalizeEntityType which aims to remove non-enabled entities from the Draftail editor.

Current State
Currently, pasting from Word or HTML does strip out invalid inline entities and removes blocks that have invalid entities entirely. Similarly, pasting from another Draftail editor strips these out.

TODO

• If you paste into an existing block, the entity text for images will not be removed (but the entityMap and entityRanges will be).
• When a block is removed, it is still selected. This is currently solved by moving the selection to the end of the content (moveSelectionToEnd) but this is incorrect. If there are additional blocks after the paste, the selection will still be moved to the end which is not desired behavior.
• <hr /> are not removed.
• Not sure if findEntityRanges is the best solution.
• Currently no validation that blocks removed have the ATOMIC type because the TYPE of the image block is unstyled when it's pasted (unless it's from another draftail editor?)
• Needs tests

I can potentially work more on this. Please feel free to add comments/suggestions.

[thibaudcolas]

🚀 Merging into the other rich paste branch, will tackle the todos there. Thank you @inostia!