Merge params/* and remove index files and re-exports (#144)

This:
- Makes it so there's only one true way to import anything
- Prevents IDE from assuming it's Node and generating an import of the
  directory containing an `index.ts` (e.g. 'path/to/' for 'path/to/index.js').
- Without blowing up the total number of imports too much
diff --git a/src/webgpu/examples.spec.ts b/src/webgpu/examples.spec.ts
index 76ef530..7cbe5b7 100644
--- a/src/webgpu/examples.spec.ts
+++ b/src/webgpu/examples.spec.ts
@@ -4,7 +4,7 @@
 Start here when looking for examples of basic framework usage.
 `;
 
-import { TestGroup } from '../common/framework/index.js';
+import { TestGroup } from '../common/framework/test_group.js';
 
 import { GPUTest } from './gpu_test.js';