Update scripts/hdr-toys-helper

[natural-harmonia-gropius]

Current plans:

• [x] Port to hdr-toys.js
• [x] Remove hdr-toys-helper.lua
• [x] Use hdr-metadata, drop deprecated sig-peak
• [ ] Automatically set L_sdr=100 for PQ, 203 for HLG. (though they all should be 203, but real PQ contents mostly use 100)
• [ ] Automatically set input-primary/transfer, output-primary/transfer
• [ ] Automatically set profile instead of lots of config lines
• [ ] Update dynamic.glsl, if it's needed