feat: Flatten providers into strings per role TDE-1291 (#1108)

#### Motivation

Make this information easier to process for GIS tools.

#### Checklist

- [x] Tests updated
- [ ] Docs updated
- [x] Issue linked in Title

---------

Co-authored-by: Wentao Kuang <[email protected]>
Co-authored-by: Blayne Chard <[email protected]>

src/commands/mapsheet-coverage/__test__/mapsheet.coverage.test.ts

@@ -37,6 +37,16 @@ function fakeCollection(id: string): StacCollection {
     description: `Layer ${id.toUpperCase()} Description`,
     assets: { capture_area: { href: './capture-area.json' } },
     links: [],
+    providers: [
+      {
+        name: 'First provider',
+        roles: ['producer', 'licensor', 'processor'],
+      },
+      {
+        name: 'Second provider',
+        roles: ['producer'],
+      },
+    ],
   } as unknown as StacCollection;
 }
 
@@ -112,6 +122,9 @@ describe('mapsheet-coverage', () => {
       id: 'layer-a-id',
       license: 'CC-BY-4.0',
       source: 'ms://layers/a/collection.json',
+      licensor: 'First provider',
+      processor: 'First provider',
+      producer: 'First provider, Second provider',
     });
     assert.equal(captureDates.features.length, 1);
   });

src/commands/mapsheet-coverage/mapsheet.coverage.ts

@@ -144,7 +144,19 @@ export const commandMapSheetCoverage = command({
       captureArea.properties['description'] = collection.description;
       captureArea.properties['id'] = collection.id;
       captureArea.properties['license'] = collection.license;
-      captureArea.properties['providers'] = collection.providers;
+
+      const roleToNames = new Map<string, Set<string>>();
+      for (const provider of collection.providers ?? []) {
+        for (const role of provider.roles ?? []) {
+          const names = roleToNames.get(role) ?? new Set<string>();
+          names.add(provider.name);
+          roleToNames.set(role, names);
+        }
+      }
+      for (const [role, names] of roleToNames) {
+        captureArea.properties[role] = [...names].join(', ');
+      }
+
       captureArea.properties['source'] = targetCollection.href;
       if (flownDates) captureArea.properties['flown_from'] = flownDates[0];
       if (flownDates) captureArea.properties['flown_to'] = flownDates[1];