Add support for pip list --outdated (#8872)

## Summary

Closes #2150.

crates/uv-cli/src/compat.rs

@@ -167,26 +167,19 @@ impl CompatArgs for PipCompileCompatArgs {
 pub struct PipListCompatArgs {
     #[clap(long, hide = true)]
     disable_pip_version_check: bool,
-
-    #[clap(long, hide = true)]
-    outdated: bool,
 }
 
 impl CompatArgs for PipListCompatArgs {
     /// Validate the arguments passed for `pip list` compatibility.
     ///
     /// This method will warn when an argument is passed that has no effect but matches uv's
     /// behavior. If an argument is passed that does _not_ match uv's behavior (e.g.,
-    /// `--outdated`), this method will return an error.
+    /// `--disable-pip-version-check`), this method will return an error.
     fn validate(&self) -> Result<()> {
         if self.disable_pip_version_check {
             warn_user!("pip's `--disable-pip-version-check` has no effect");
         }
 
-        if self.outdated {
-            return Err(anyhow!("pip's `--outdated` is unsupported"));
-        }
-
         Ok(())
     }
 }

crates/uv-cli/src/lib.rs

@@ -1907,6 +1907,16 @@ pub struct PipListArgs {
     #[arg(long, value_enum, default_value_t = ListFormat::default())]
     pub format: ListFormat,
 
+    /// List outdated packages.
+    ///
+    /// The latest version of each package will be shown alongside the installed version. Up-to-date
+    /// packages will be omitted from the output.
+    #[arg(long, overrides_with("no_outdated"))]
+    pub outdated: bool,
+
+    #[arg(long, overrides_with("outdated"), hide = true)]
+    pub no_outdated: bool,
+
     /// Validate the Python environment, to detect packages with missing dependencies and other
     /// issues.
     #[arg(long, overrides_with("no_strict"))]

crates/uv/Cargo.toml

@@ -79,6 +79,7 @@ petgraph = { workspace = true }
 rayon = { workspace = true }
 regex = { workspace = true }
 reqwest = { workspace = true }
+rkyv = { workspace = true }
 rustc-hash = { workspace = true }
 serde = { workspace = true }
 serde_json = { workspace = true }