Add type declerations for generator options

[Joehoel]

First off there was a missing comma in the docs.

To have better intellisense when using this package I added type declarations for the generator options. And to match it up with the docs I changed the out option to output

export interface GQueryGenerateOptions {
    schema: string;
    output: string;
    gPath: string;
    debug?: boolean;
}

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