T14754 paginator cursor

[niden]

Hello!

• Type: new feature
• Link to issue: [NFR]: SQL Instrumental key pagination #14754

In raising this pull request, I confirm the following:

• I have read and understood the Contributing Guidelines
• I have checked that another pull request for this purpose does not exist
• I wrote some tests for this PR
• I have updated the relevant CHANGELOG
• I have created a PR for the documentation about this change

Added Phalcon\Paginator\Adapter\QueryBuilderCursor — a keyset (cursor-based) pagination adapter that accepts a QueryBuilder, a limit, and a cursorColumn (the column used as the cursor key, typically a primary key). Each paginate() call fetches limit + 1 rows using cursorColumn > :cursor: to skip already-seen rows; the extra row is used only to detect whether a next page exists and is never returned. getNext() returns the last visible row's cursor value, or 0 when no further page exists. setCursor(int|null $cursor) advances or resets the position. getTotalItems() and getLast() return 0 by design — no COUNT query is issued. Registered in PaginatorFactory as "queryBuilderCursor"

Thanks