Add vastlint to SCTE-35 & SCTE-104

[aleksUIX]

Summary

• add vastlint under SCTE-35 & SCTE-104

Why

• vastlint validates and lints VAST video ad tags
• while VAST is not SCTE-35 itself, it is commonly adjacent to streaming ad insertion and video ad signaling workflows that broadcasters and OTT teams debug alongside SCTE markers
• the project is open source and the primary link points to the code repository

Disclosure

• I maintain vastlint, so this is a self-submission rather than a third-party recommendation.