media/photo share function - add to long-press menu

[gerbrent]

Summary

Currently when viewing a photograph that was shared in a Talk conversation - i.e. clicking on the photograph to view full screen - there is a Share option under the 3-dot menu.

Currently when long-pressing a photograph that was shared in a Talk conversation, the resulting menu does not contain the Share function.

Describe the solution you'd like
Would be great to implement the same Share function in the long-press menu.
This would offer a simpler workflow: no need to expand a photograph full-screen just to share it.
There is also arguably plenty of screen real-estate to accommodate another function in the long-press menu.

[Smarshal21]

i am working on this

[Smarshal21]

i implemented this here - #3284