feat(spiders/fetchers): Adding proxy rotation logic and change retry logic

- User passes a single proxy to the browser session, and it will keep using the same context. Pass a proxy manager that automatically refreshes the IP with each proxy, and you get speed but sacrifice some stealth.

- User imports the proxy rotator class and passes proxies to it and a rotation strategy (Round robin by default). Then pass the instance to the session class, which will create a context and a tab for each proxy returned by the rotator. This way, you sacrifice speed a bit, but you get maximum stealth since each context is created with the proxy that will be used.

- Normal requests use what you pass without issues, of course.

- All errors are retried now, and proxies are rotated on retries automatically.

scrapling/engines/constants.py

@@ -57,7 +57,6 @@ DEFAULT_STEALTH_FLAGS = (
     "--ignore-gpu-blocklist",
     "--enable-tcp-fast-open",
     "--enable-web-bluetooth",
-    "--disable-hang-monitor",
     "--disable-cloud-import",
     "--disable-print-preview",
     "--disable-dev-shm-usage",
@@ -84,7 +83,6 @@ DEFAULT_STEALTH_FLAGS = (
     "--prerender-from-omnibox=disabled",
     "--safebrowsing-disable-auto-update",
     "--disable-offer-upload-credit-cards",
-    "--disable-features=site-per-process",
     "--disable-background-timer-throttling",
     "--disable-new-content-rendering-timeout",
     "--run-all-compositor-stages-before-draw",