Improvements and bugfixes

To initiate a new Studio without installing the CLI globally:

npm create sanity@latest

To upgrade a v3 Studio, run this command in its folder:

npm install sanity@latest

• Improves the Portable Text Editors backspace handling on text blocks that follows a non-text block
• Fixes an issue where the Portable Text Editor would crash if a block with its children property set to undefined was inserted
• Ensures that StudioLayout utilizes the components API when used in isolation
• Fixes some performance issues related to entering text into all compatible Studio inputs. Typing in Studio inputs should now be noticably faster, in particular for schema types with a lot of deeply nested fields.
• Adds node.module to package.json which improves compatibility with Webpack, Astro, Svelte and Vue