[native] "Flip the switch" to enable video messages

Summary:
Now that we have video messages working end-to-end, we can "flip the switch" to enable video messages.

Specifically:

1. Set serverCanHandle to true for video types in lib/media/file-utils
2. Set versionCode for hasMinCodeVersion check in multimedia-message-spec to 148
3. Add MediaLibrary.MediaType.video to mediaType array in multimedia-gallery-keyboard.react so users can select videos from their media gallery

Depends on D5240

Test Plan:
All the diffs that came before this one in the stack tested various part of the video message system.

Outside of that I've done a lot of testing on iOS/Android and different codeVersions to make sure that things work as expected... and I'm going to do a lot more before I land this diff.

Reviewers: tomek, marcin, abosh, ashoat

Reviewed By: tomek

Differential Revision: https://phab.comm.dev/D5241