fix: enforce stricter type for lite

[ocavue]

Any non-string values passed to clsx/lite are intentionally ignored, thus passing arrays or objects to it is likely an error.

// NOTE: Any non-string input(s) ignored
clsx({ foo: true });

Currently, clsx and clsx/lite use the same type declaration, resulting in these user errors not being identified by type checking.

This pull request introduces a new type declaration for clsx/lite. In comparison to the previous declaration, the follow argument types are still accectped:

• string | boolean | undefined | null

and the following types are not accepted anymore:

• ClassArray | ClassDictionary | number | bigint

This should help catch user errors.