addInitScript on browserContext level

[nexcode]

https://playwright.dev/docs/api/class-browsercontext#browser-context-add-init-script

This is a convenient API that allows you to simply add a script that will be executed every time a new page is created.
It would be very convenient if it was possible to use this for each BrowserContextID separately.

[github-actions]

Please add a valid Rod Version: v0.0.0 to your issue. Current version is v0.116.2

_{generated by check-issue}