Add new proxy.rs module with get_proxies and get_providers_proxies commands.
Update mod.rs and lib.rs to re-export and register proxy commands.
Update API.ts to use invoke for proxy commands.
Minor formatting improvements in module/mihomo.rs.
* feat: allow manual selection of url-test group
* feat: fixed proxy indicator
* fix: try to fix traffic websocket no longer updating
* fixup: group delay test use defined url