chore: export BodyParserOptions

[chentsulin]

The original @types/koa-bodyparser has this Options export: https://github.com/DefinitelyTyped/DefinitelyTyped/blob/master/types/koa-bodyparser/index.d.ts#L32-L87

Add it back to support this usage.

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[3imed-jaberi]

I don't think that we need to export the types here because we can extract it like this;

type ExtractedOption = NonNullable<Parameters<typeof bodyParserWrapper>[0]>

and you can check the following image, it's work perfectly!