[xPaw]

Remove dynamic WebAPI interfaces

Closes #1434.

WebAPI.Interface and WebAPI.AsyncInterface no longer derive from DynamicObject. Use Call / CallAsync / CallProtobufAsync. Factories are unchanged.

List arguments are now flattened to name[0], name[1]… by the typed calls too (previously dynamic only).

If #1651 lands first, this PR will also drop the DynamicObject IL3050 suppressions and re-enable PublishAot for sample 021.

Breaking changes

Calls through dynamic still compile but throw RuntimeBinderException at runtime.

// before
dynamic iface = WebAPI.GetInterface( "ISteamNews" );
KeyValue news = iface.GetNewsForApp2( appid: 440, method: HttpMethod.Post );

// after
var iface = WebAPI.GetAsyncInterface( "ISteamNews" );
KeyValue news = await iface.CallAsync( HttpMethod.Post, "GetNewsForApp", 2, new() { [ "appid" ] = 440 } );

The version suffix becomes the version argument, and method: becomes the first argument.

Usage

About 31 of SteamKit's 918 GitHub dependents call through dynamic, mostly stale SteamBot forks and small bots. Nearly all pin SteamKit2 1.x or 2.x; only two are on 3.x. Projects that already use CallAsync, such as ArchiSteamFarm, are unaffected.