Add Gatewayz provider with 351 models#365

vdimarco wants to merge 3 commits intosst:devsst/models.dev:devfrom

Alpaca-Network:terragon/add-gatewayz-models-to-models-dev-ehda3lAlpaca-Network/models.dev:terragon/add-gatewayz-models-to-models-dev-ehda3lCopy head branch name to clipboard