Show|Create|EditGuesser viewComponent prop

[PawelSuwinski]

In Create/EditGuesser form component can be customised by passing down formComponent prop as renamed component prop (to avoid name collision). Guessers use base RA components that also can take component prop for such customisation but it is omitted, so any further customisation needs a lot of code to assembly custom guesser replacement, so for completeness and simplifying any customisation we can pass this other renamed component prop in this way. WDYT?

See:

• https://marmelab.com/react-admin/Show.html#component
• https://marmelab.com/react-admin/Create.html#component
• https://marmelab.com/react-admin/Edit.html#component