`predictions`: Create tool for viewing and participating in channel point predictions

see:
- https://help.twitch.tv/s/article/channel-points-predictions?language=en_US
- https://github.com/Tkd-Alex/Twitch-Channel-Points-Miner-v2/blob/0c5f2f3a1fd8889985acc5cbe58af53d06fb7f53/TwitchChannelPointsMiner/constants.py#L102-L110

Start with the Twitch channel point predictions documentation and the referenced constants.py lines in Twitch-Channel-Points-Miner to understand the prediction concepts and identifiers. Then inspect ttv-cli's existing command entry points and determine how viewing and participating should fit the CLI. Done means the tool can support both prediction viewing and participation, but the issue does not define the command design or acceptance details.

Rédigé par le modèle d'indexation à partir du texte de l'issue.