fix(storage): add explicit .js extensions to ES module imports

[thgaskell]

Update all relative imports in the storage module to include explicit .js file extensions, as required by Node.js ES modules. This resolves the "Directory import is not supported resolving ES modules" error.

Fixes extensionless imports that cause failures in ES module environments like Vitest.

[jaygiang]

Ran npm test and it LGTM ✅

Found a couple that are missing the .js import. They aren't causing vitest failures, but not sure if it would cause issues in the future:

In on-device-storage/storage/ directory:

• index.js:1-4 - 4 imports without .js
• IndexedDBMethod.js:1-2 - 2 imports without .js
• LocalStorageMethod.js:1 - 1 import without .js

In main package file:

• index.js:1-2 - 2 imports without .js

In utilities:

• on-device-storage/utilities/index.js:1 - 1 import without .js

[thgaskell]

It's not necessary to update the example application code since it runs through vite. This update fixes an issue with modules that import the ESM version of the radfish package.