Exclude network request time from dotLottie viewer load time

[theashraf]

In the dotLottie viewer, the load time should only reflect the duration it takes to load the lottie or dotLottie data, excluding the network request's load time for the source file

[github-actions[bot]]

This issue has been automatically marked as stale because it has not had recent activity. It will be closed in 7 days if no further activity occurs.