Add serverside row creation

[Janpot]

Closes #2888

This PR introduces the following changes:

• when the data provider contains a createRecord method, the grid will have an "add record" button in the toolbar
• clicking this button will add a row at the top of the grid in draft mode
• when clicking "update" after editing the row, the grid will call createRecord on the provider with the new values
• all crud operations are disabled for all rows when one is in editing mode
• a row in editing has to be explicitly updated or canceled, no focus events
• createRecord and updateRecord must now return the created or updated record so the grid can update UI accordingly. This is important in scenarios where the server has to generate defaults for something
• add a notification system for success/failure of the crud operations. When creating a new record, a link is created in the notification which scrolls the grid to the newly created item.

changes to public API:

• dataprovider updateRecord can now optionally return a record to replace the one from the grid.
• dataprovider now supports createRecord, which has the same signature as updateRecord minus the id parameter.

Screen.Recording.2024-01-09.at.18.36.17.mov

docs: https://deploy-preview-3058--mui-toolpad-docs.netlify.app/toolpad/concepts/data-providers/#row-creation

• docs
• tests

[bharatkashyap]

A video might be helpful to those tracking progress/interested in this feature?