Include a shortcut for weather options in Add Sky

[TheDuckCow]

Check against existing requests

• I have checked existing feature requests, and my idea is different

Describe the context

This is a feature request coming from my YouTube tutorial here on adding weather, where a user suggested having the option to specify weather while setting up MC sky.

While I mentioned I like having very different kinds of operations split in different areas, I also get the appeal of quick access to operations which from a user standpoint would indeed seem related. When adding sky, it does make sense you're likely also thinking about the weather (or lack thereof).

How do you imagine your feature works?

We could just add a dropdown for weather effect which pulls from the data list on weather effects, adding an additional enum prefix for "Clear" to indicate no weather by default.

What existing workaround (or closest thing to a workaround) do you have today (within Blender, MCprep, or any software)? If there is no workaround, explain why you feel this way.

Running the two functions separately, and MC Sky and then later add weather. Not that bad of a workaround and tutorials cover how to do this, but does make the addon feel more "all over the place" as related activities are not next to each other.