LiveKit Rust SDKs v0.7.46 — GLib now optional, SFU transceiver crash fixed

Features

Make GLib an opt-in dependency

webrtc-sys no longer links against glib-2.0/gobject-2.0/gio-2.0 by default.

Breaking: Wayland screen sharing now requires the glib-main-loop feature on livekit (or libwebrtc).

Fixes

• Add track publishing doc example
• Fix silent subscription failures in single-pc mode when the SFU reuses an existing empty transceiver for a new remote track. Also make RtpTransceiver::mid() safe to call on transceivers that haven't been negotiated yet — libwebrtc is built with -fno-exceptions, so std::optional::value() aborted the process instead of throwing.
• Add LK_DISABLE_NVDEC to bypass NVIDIA NVDEC decoder registration when the environment variable is set.
• return DeviceNotFound when device is not there for set_recording_devi… - #1155 (@xianshijing-lk)

Add dynacast support - #1003 (@chenosaurus, @stephen-derosa)

This includes a minor breaking change for libwebrtc: RtpParameters now contains additional RTP sender state that must be preserved when round-tripping through set_parameters().