add typings to get_store_value

[tanhauhau]

Worked on top of #5194

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• It's really useful if your PR relates to an outstanding issue, so please reference it in your PR, or create an explanatory one for discussion. In many cases, features are absent for a reason.
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• Ideally, include a test that fails without this PR but passes with it. PRs will only be merged once they pass CI. (Remember to npm run lint!)

Tests

• Run the tests with npm test or yarn test)

[Conduitry]

This has been released in 3.29.0.