Add the "skip" parameter to the find collection operation in Payload API

[MurzNN]

For now, Payload API's find operation misses the skip parameter, which is usually present in most of the database query functions and other APIs.

Instead of it, there is a page parameter that implements almost the same feature, but it works only in conjunction with the limit parameter.

This limitation makes it impossible to make queries that just skip a specific number of items in the query, but these cases are not rare, here is an example of one of such cases: #16196

From the technical side, it's not hard to implement; the hard part is only to make them not work together, so accept this parameter only if the pagination is off.

But to improve the developer experience, let's still add the skip parameter to the find operations!