feat(query): add options parameter to Query.prototype.sort()

[vkarpov15]

Fix #14365

Summary

Right now, sort(null) is a no-op. There's no good way to unset the current sort option other than delete query.getOptions().sort, which works but looks a bit janky. This PR adds q.sort(null, { override: true }), the override option lets you explicitly override the current sort.

Examples

[FaizBShah]

This looks good to me. Can we also add the documentation for the 2nd parameter override in setOptions() function in this PR? (Or is that out of scope of this PR?)

[hasezoey]

Looks good to me.
As for the "condition boolean checks instead of truthy" issue, i am impartial, as i think both methods are being used in mongoose and not anything specific is set to be used.