[BUG]: merge function in @halvaradop/tailwindcss-merge returns a promise

[halvaradop]

In the current version of the merge function from the @halvaradop/tailwindcss-merge package, it returns a promise. This behavior forces users to use the merge function only in server-side components. This is problematic because many components in a project are rendered on the client side, making the merge function unusable in those components.

Additionally, the className and class attributes for React and HTML do not support asynchronous processing, which conflicts with the current behavior of the merge function.

const merge: (classes: string) => Promise<string>;

[github-actions]

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