Addressing review comments from Luke - moqjs

[TilsonJoji]

This is related to previous PR : #1

Addressing review comments received on kixelated#103 and making the catalog compliant with https://www.ietf.org/archive/id/draft-ietf-moq-catalogformat-01.html

Related PR in moq-js : TilsonJoji/moq-rs#2

[TilsonJoji]

UT

Catalog post code changes

[2024-07-11T13:43:13Z INFO moq_pub::media] catalog: {
"version": 1,
"streamingFormat": 1,
"streamingFormatVersion": "0.2",
"supportsDeltaUpdates": true,
"commonTrackFields": {
"namespace": "quic.video/watch/bbb",
"packaging": "cmaf",
"renderGroup": 1,
"altGroup": 1
},
"tracks": [
{
"name": "video_720p",
"initTrack": "0.mp4",
"initData": "1.m4s",
"selectionParams": {
"codec": "avc1.64001F",
"width": 1280,
"height": 720
}
},
{
"name": "audio",
"initTrack": "0.mp4",
"initData": "2.m4s",
"selectionParams": {
"codec": "mp4a.40.2",
"bitrate": 125587,
"samplerate": 44100,
"channelConfig": 2
}
}
]
}