This work adds the functionality that when an image is selected ineither the select image step of the image upload modal, or by using the toolbar inside tinymce, the requisite image is loaded into the settings page, and on the click of the save button, it is inserted into tinymce html.
* feat: devgallery api mode
* chore: update react version
* feat: dev gallery app
* chore: fix component tests
* chore: lint fixes
* chore: link mock block ids to real block type api