Add ability to trim

[jonbell-lot23]

This comes from Kacper:

• it's pretty annoying that when starting the recording, the page refreshes, so I might loose the context or just have to repeat some additional steps after that;

• the above might sometimes make the recordings quite longer than actually necessary. We are still experiencing some performance issues with the longer replays form our application, and there is no actual way to "trim" them, or edit in any way.

• there is also another issue regarding the refreshing - when you start the recording, and then refresh the page or do some navigation while still recording, either the recording stops (without saving), sometimes it just shows the "dark" screen and when you stop the video, it contains only the part "after" the refreshing (so in terms of the darks screen it's actually nothing). I've struggled with it a couple of times. Some issues generally are tightly coupled with the navigation, or refreshing the page.

Putting here for discussion.

[jonbell-lot23]

Marked as fixed