[Feature] support named parameters

re https://github.com/Automattic/mongoose/pull/10360#issuecomment-862245274 It would be nice if we support named parameters for mongoose methods. It should be straightforward to implement, I'll start with the following:

• Model.find
• Model.findOne
• Model.updateOne
• Model.updateMany
• Model.countDocuments
• Model.validate
• Model.aggregate
• Model.exists

Then we can decide what other functions we can apply the pattern to.