feat(ios): detect livestreams in now playing notification

[paul-rinaldi]

…am playing

This addresses part of #3902

Apple however does encourage going further, "Consider indicating the progress of currently playing live content. People appreciate knowing where they’ll land when they jump into in-progress live content. You can use a progress bar or other indicator to show people how much content remains." (source: Apple Design Guidelines). However , Apple does not indicate if this goes for the minimal view of a Now Playing view. So this may be sufficient for many developers and audiences.

• Provide an example of how to test the change
  To test the change,

1. generate an ios build of the example/basic app,
2. load it on a physical ios device,
3. tap show notification controls on the ui,
4. Drag from the top to see the notification controls

• Describe the changes

Summary

Adds "LIVE" decorator to livestream notification (now playing)

Playback (can't remember which it was in example):

Live (red bull live, another live sample):

Motivation

Saw that livestreams in our app show just ---- ---- which is what some apps (AP News, CNN (their pause/play doesn't work correctly though)) do on iOS but a few we saw show a LIVE decorator. To ensure our audience understand what is being shown, we should add this code.
iOS Apps that show --_-- on each side of a livestream now playing control center view: Fox (doesn't allow background play), FM Radio, NBC

Changes

Added a check to determine if live content is currently playing

Test plan

None

[KrzysztofMoch]

besides comment from freeboub, It looks good to me

[paul-rinaldi]

Using @YangJonghun 's suggestion worked, live videos show as live and normal show as normal ones in example/basic! Worked.

As a side note, I tried the metadata way and that was not working, though it was fairly complex due to the iOS types so that is where it could have not worked correctly. Although passing a flag via metadata seemed, it may not be possible.

[freeboub]

Using @YangJonghun 's suggestion worked, live videos show as live and normal show as normal ones in example/basic! Worked.

As a side note, I tried the metadata way and that was not working, though it was fairly complex due to the iOS types so that is where it could have not worked correctly. Although passing a flag via metadata seemed, it may not be possible.

That works for me ! Thank you

[paulrinaldi]

Corrected the styling.