feat: add hints for missing n5 and zarr metadata

[allison-truhlar]

Clickup id: 86afkemw3

This PR adds a MetadataHint component that renders a notification where a N5 or Zarr preview component would go, in cases where a directory might be a N5 or Zarr dataset based on name or partial file structure. The notification explains what is required to see a preview component for the dataset type. The notification also serves as a location to surface N5 and Zarr metadata query errors that prevent the preview component from showing - these were previously just logged to the console.

The main change is thefrontend/src/components/ui/BrowsePage/MetadataHint.tsx notification component. It renders above the file browser for each of eight hint cases:

• (1) A folder with a .zarr extension, but the Zarr metadata query does not fire = to see the preview, requires adding a Zarr marker file (.zarray, .zattrs, or zarr.json)
• The Zarr metadata query fires but returns null.
  • (2) If a .zattrs file (Zarr v2) is found = to see the preview, add the multiscales field to .zattrs. Or, to preview as an array, use .zarray instead.
  • (3) If a zarr.json file (Zarr v3) is found = to see the preview, add multiscales field
• (4) Zarr metadata query error
• A folder with a .n5 extension that:
  • (5) Has neither an s0/ folder or attributes.json
  • (6) Has an s0/ folder but no attributes.json
  • (7) Has an attributes.json file but no s0/ folder
• (8) N5 metadata query error