Return enums instead of strings in Jason's exported functions

[alexlapa]

Synopsis

Как-то так повелось, что enum'ы в js'ку мы возвращаем в виде строк, так как решили что для js'ки так будет более идиоматично. При этом в функциях которые принимают enum'ы, мы принимаем enum'ы. Хочется достичь консистентности: мы или и принимаем и возвращаем enum'ы, или мы и принимаем и возвращаем стринги.

Склоняюсь к первому варианту.

Solution

1. Expose MediaKind and MediaSourceKind enums.
2. Change some exported functions return types:
   InputDeviceInfo.kind -> String => InputDeviceInfo.kind -> MediaKind
MediaTrack.kind -> String => MediaTrack.kind -> MediaKind
MediaTrack.media_source_kind -> String => MediaTrack.media_source_kind -> MediaSourceKind
3. Internally we use 3 enums with Audio and Video variants: InputDeviceKind, TransceiverKind and MediaTrackKind. Get rid of those in favor of MediaKind enum.

Checklist

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[alexlapa]

Return enums instead of strings in Jason's exported functions (#146)

- export MediaKind and MediaSourceKind enums to JS
- InputDeviceInfo::kind now returns MediaKind instead of String
- MediaTrack::kind now returns MediaKind instead of String
- MediaTrack::media_source_kind now returns MediaSourceKind instead of String