fix: improve Vue nodeViewProps typing

[DanSnow]

Description

This PR add as const to every required options in nodeViewProps.

Resolved #2654

Testing

1. run yarn rollup -c --scope @tiptap/vue-2 and yarn rollup -c --scope @tiptap/vue-3
2. Then verify the typing is

export declare const nodeViewProps: {
    editor: {
        type: PropType<import("@tiptap/core").Editor>;
        required: true;
    };
   // ...
}

instead of:

export declare const nodeViewProps: {
    editor: {
        type: PropType<import("@tiptap/core").Editor>;
        required: boolean;
    };
   // ...
}

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