types(model): make bulkWrite() types more flexible to account for casting

[vkarpov15]

Re: #14400

Summary

Bringing MongoDB's AnyBulkWriteOperation type into Mongoose, and overriding update with Mongoose's UpdateQuery type to account for query casting. Currently, the issue is that bulkWrite([{ updateOne: { $set: { date: '2023-06-01' } } }]) fails type checks because date needs to be of type date. And passing in AnyKeys<> is a no-go because that messes up MongoDB's $addToSet type checking and makes the bulkWriteAddToSet test in models.test.ts fail

Examples

[hasezoey]

I think the changes look good aside from some minor nit-picks. Maybe also consider adding the update no casting warning to the typescript types