Give each crawler instance its own default request queue #2132

BasicCrawler.get_request_manager() (src/crawlee/crawlers/_basic/_basic_crawler.py) opens the same default request queue for every crawler, so two crawlers in one process silently share requests and deduplication state. Only the first instance should use the default queue; the rest should get their own via an internal alias derived from the crawler id.

JS implementation: apify/crawlee#3834

This will be a breaking change.

✍️ Drafted by Claude Code