**What**
- Adds missing Metadata form for collections
- Fixes type of metadata in update payload
- Fixes an issue where deleting the last row of a metadata form would prevent adding new ones.
Resolves SUP-784
Resolves CMRC-627
**What**
- If the session expired, and the user then navigated to a route with no loader the request for the user info in the sidebar would fail causing the app to crash as we didn't have an errorElement wrapping the app shell.
- This PR adds a top level errorElement which handles errors that are outside of a page context, such as in the sidebar.
**What**
- Adds Breadcrumb component to all routes that needs breadcrumbs.
- The Breadcrumb components use a combination of loader data and useQuery to ensure that the displayed value is kept up to date if the underlying data is changed via a mutation.
- Also fixes a couple of places where the breadcrumb was not setup correctly.
Resolves CMRC-688
**What**
- Renames /admin-next -> /admin
- Renames @medusajs/admin-sdk -> @medusajs/admin-bundler
- Creates a new package called @medusajs/admin-sdk that will hold all tooling relevant to creating admin extensions. This is currently `defineRouteConfig` and `defineWidgetConfig`, but will eventually also export methods for adding custom fields, register translation, etc.
- cc: @shahednasser we should update the examples in the docs so these functions are imported from `@medusajs/admin-sdk`. People will also need to install the package in their project, as it's no longer a transient dependency.
- cc: @olivermrbl we might want to publish a changelog when this is merged, as it is a breaking change, and will require people to import the `defineXConfig` from the new package instead of `@medusajs/admin-shared`.
- Updates CODEOWNERS so /admin packages does not require a review from the UI team.
