Forward cli serve settings and make it easier to provide platform config to fullstack (#2521)

* assert that launch never returns for better compiler errors

* fix static generation launch function

* fix web renderer

* pass context providers into server functions

* add an example for FromContext

* clean up DioxusRouterExt

* fix server function context

* fix fullstack desktop example

* forward CLI serve settings to fullstack

* re-export serve config at the root of fullstack

* forward env directly instead of using a guard

* just set the port in the CLI for fullstack playwright tests

* fix fullstack dioxus-cli-config feature

* fix launch server merge conflicts

* fix fullstack launch context

* run web playwright tests on 9999 to avoid port conflicts with other local servers

* fix playwright tests

packages/cli-config/src/serve.rs

@@ -0,0 +1,35 @@
+use clap::Parser;
+
+/// Arguments for the serve command
+#[derive(Clone, Debug, Parser, serde::Serialize, serde::Deserialize)]
+pub struct ServeArguments {
+    /// The port the server will run on
+    #[clap(long)]
+    #[clap(default_value_t = default_port())]
+    pub port: u16,
+    /// The address the server will run on
+    #[clap(long)]
+    pub addr: Option<std::net::IpAddr>,
+}
+
+impl Default for ServeArguments {
+    fn default() -> Self {
+        Self {
+            port: default_port(),
+            addr: None,
+        }
+    }
+}
+
+impl ServeArguments {
+    /// Attempt to read the current serve settings from the CLI. This will only be set for the fullstack platform on recent versions of the CLI.
+    pub fn from_cli() -> Option<Self> {
+        std::env::var(crate::__private::SERVE_ENV)
+            .ok()
+            .and_then(|json| serde_json::from_str(&json).ok())
+    }
+}
+
+fn default_port() -> u16 {
+    8080
+}