Display time when dragging a video's progress bar.

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## The Issue
Unlike on YouTube, where when you drag a progress bar the current video time changes to when you'll resume at any given point in the bar, LBRY makes no display of precise time selection at all, making it quite a hassle to navigate videos - you basically just have to guess and make rough estimates for where you want to drag the time bar.

### Possible solutions
It could be implemented like YouTube, where the current time is just replaced with the given progress bar time.
Alternatively, it could be displayed side by side. For example, if you are watching a video at 13:35, and you drag it backwards by three minutes, the timestamp on the left could be changed from `13:35` to `13:35 -> 10:35`, or `13:35 / 10:35`.
Another idea would be to display it on the screen, similar to a Samsung Android video player, potentially together with the time difference (e.g. `-03:00`, or `+03:00` forwards).

## System Configuration
- Device: Samsung Galaxy A8 2018
- Android version: 9

Start by locating the Android video player's progress-bar and seek-handling entry points. Review how dragging currently updates playback position, then make the selected time visible while dragging; done means users can identify the precise position before resuming playback.

Written by the indexing model from the issue text.