Add shouldShowSidebarLink to registerOperatorRoute

[loan-laux]

Impact: minor
Type: feature

Issue

There's currently no clean way for developers to programmatically decide whether to show their reaction-admin plugin's link in the sidebar depending on the current shop.

Solution

Introduce the shouldShowSidebarLink option for registerOperatorRoute. shouldShowSidebarLink takes a function that should expect the current shop as its only argument and should return true if the sidebar link should be shown, or false if it shouldn't.

Example usage for a link should only be shown when viewing the primary shop:

registerOperatorRoute({
  group: "navigation",
  mainComponent: SomePlugin,
  path: "/some-plugin",
  shouldShowSidebarLink: (currentShop) => currentShop.shopType === "primary"
});

Breaking changes

None.

Testing

1. Register a route using shouldShowSidebarLink.
2. Make sure the route link show up (or doesn't) as you expect it to in the sidebar.