Feature/replace and find image

[Polleke007]

Feature request for #166

• Is replacing all images, also deeply nested images.
• Performance: 30 images replaced in 15 seconds (depending on internet connection, latency, structure etc)
• Fields that are defined within the image schema aren't changed and the value stays the same
• There can only be 1 image replaced at the time
• Once you have selected a replacement image and the process is started you can still navigate through Sanity Studio (refresh the page is stopping the process)

[aozora]

This PR is so relevant, why it seems abandoned by over 7 months now?
Missing this features is blocking a deal with a customer, preferring other Headless CMS that already have it.