Add MP4 to Transcode API

[leszko]

It also updates the Catalyst API VOD according to the design here: https://www.notion.so/livepeer/VOD-MP4-separate-from-HLS-34efd71b091a491ea4e785dda3bf9873

[codecov]

Codecov Report

Merging #176 (8bafeff) into main (58ebeda) will increase coverage by 0.95848%.
The diff coverage is 60.86957%.

❗ Current head 8bafeff differs from pull request most recent head 76e0f8d. Consider uploading reports for the commit 76e0f8d to get more accurate results

@@                 Coverage Diff                 @@
##                main        #176         +/-   ##
===================================================
+ Coverage   11.95952%   12.91800%   +0.95848%     
===================================================
  Files             14          14                 
  Lines           2174        2183          +9     
===================================================
+ Hits             260         282         +22     
+ Misses          1895        1880         -15     
- Partials          19          21          +2     

Impacted Files	Coverage Δ
clients/catalyst.go	83.95062% <ø> (ø)
task/paths.go	0.00000% <ø> (ø)
task/upload.go	11.15789% <60.86957%> (+4.47686%)	⬆️

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Impacted Files	Coverage Δ
clients/catalyst.go	83.95062% <ø> (ø)
task/paths.go	0.00000% <ø> (ø)
task/upload.go	11.15789% <60.86957%> (+4.47686%)	⬆️

[thomshutt]

Other than my comments this LGTM - I don't think either of them is a blocker, so your call on addressing them