UserData Generic for router

[mstephen19]

Right now, we are able to define the type of the userData object when creating a request/adding it to a request queue, but can't pass a generic to routerInstance.addHandler.

Here is what we have to do right now:

router.addHandler(Labels.PRODUCTS, async ({ $, request: { userData }, crawler }) => {
    const { dispensaryId, customerType, page, cookie, name } = userData as {
        dispensaryId: string;
        page: number;
        cookie: string;
        name: CustomerTypes;
        customerType: CustomerTypes;
    };
   // ...

Or this works:

router.addHandler(Labels.PRODUCTS, async ({ $, request: { userData }, crawler }: CheerioCrawlingContext<{ dispensaryId: string, /* etc. */ }>) => {
    const { dispensaryId, customerType, page, cookie, name } = userData
    // ...

But as a generic to the addHandler function it would be better:

router.addHandler<{ dispensaryId: string /* etc. */ }>(Labels.PRODUCTS, async ({ $, request: { userData }, crawler }) => {
    const { dispensaryId, customerType, page, cookie, name } = userData
    // ...