fix(aggregation-layers): Fix missing types export

[donmccurdy]

The public API of the aggregation-layers module depends on a type that isn't exported from the core module. I've made the quick fix here to export that type, resolving the error:

 node_modules/@deck.gl/aggregation-layers/dist/aggregation-layer.d.ts:16:29:
   16 │ ...ring]: import("modules/core/src/lib/attribute/attribute").default;
      ╵                  ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

This PR changes the the compiled types in aggregation-layer.d.ts:

-    getAttributes(): {
-        [id: string]: import("modules/core/src/lib/attribute/attribute").default;
-    };
+    getAttributes(): {
+        [id: string]: Attribute;
+    };

But this looks like the type of issue that could also possibly be fixed by a TS update or some of the types error detection that API-Extractor provides, if we want to go that direction.

Related:

• [Bug] Can't compile after updating to deck.gl 9.0.1 (regression) #8711

[donmccurdy]

• fix(aggregation-layers): Fix missing types export #8713 👈
• master

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[coveralls]

coverage: 89.975% (+0.001%) from 89.974%
when pulling e46d303 on donmccurdy/fix-types-aggregation-layer-attributes
into d9a78da on master.