fix: issue with functions in useStore for typescript

[nmerget]

Description

Please provide the following information:

Add ReturnType<...> to packages/core/src/helpers/get-typed-function.ts.

We don't want to return the complete function as a return type. Instead we want to return the return type of the function.

Make sure to follow the PR preparation steps in CONTRIBUTING.md before submitting your PR:

• format the codebase: from the root, run yarn fmt:prettier.
• update all snapshots (in core & CLI): from the root, run yarn test:update
• add Changeset entry: from the root, run yarn g:changeset and follow the CLI instructions. Alternatively, use the Changeset Github Bot to create the file.

[changeset-bot]

🦋 Changeset detected

Latest commit: 3b9c26b

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 2 packages

Name	Type
@builder.io/mitosis	Patch
@builder.io/mitosis-cli	Patch

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[nmerget]

@samijaber sorry I missed this problem in my PR :(

[nx-cloud]

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• nx run-many --target test --verbose
• nx build @builder.io/mitosis-site

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