Modal product updates: WebSocket support, interactive commands, and H100 GPUs

Modal has added WebSocket support to its functions, enabling out-of-the-box hosting of frameworks like Streamlit, plus interactive commands via `modal container exec` for inspecting and debugging active containers. H100 GPUs are now available on Modal, and the client update adds `@build` lifecycle hooks, automatic background commits for Volumes, and expanded CLI commands including get, put and rm.