iOS Video position preroll
iOS Video position preroll

Squashed commit of the following:

commit fd16bbdda2df918328a1763c33123ac0ab02490b
Author: asharma <asharma@appnexus.com>
Date:   Fri Jul 15 21:24:14 2022 +0530

    Added default event as standalone

commit 7e886fd343e8195a1ccdfbc14901a3f3e23126af
Author: asharma <asharma@appnexus.com>
Date:   Fri Jul 15 20:38:01 2022 +0530

    Updated Video position

appnexus/mobile-sdk-ios,appnexus/mobile-sdk-ios,appnexus/mobile-sdk-ios,appnexus/mobile-sdk-ios,appnexus/mobile-sdk-ios,appnexus/mobile-sdk-ios