Support requirements.txt files in uv tool install and uv tool run (#5362)

## Summary

Closes https://github.com/astral-sh/uv/issues/5347.
Closes https://github.com/astral-sh/uv/issues/5348.

crates/uv-cli/src/lib.rs

@@ -2208,10 +2208,14 @@ pub struct ToolRunArgs {
     #[arg(long)]
     pub from: Option<String>,
 
-    /// Include the following extra requirements.
+    /// Run with the given packages installed.
     #[arg(long)]
     pub with: Vec<String>,
 
+    /// Run with all packages listed in the given `requirements.txt` files.
+    #[arg(long, value_parser = parse_maybe_file_path)]
+    pub with_requirements: Vec<Maybe<PathBuf>>,
+
     #[command(flatten)]
     pub installer: ResolverInstallerArgs,
 
@@ -2252,6 +2256,10 @@ pub struct ToolInstallArgs {
     #[arg(long)]
     pub with: Vec<String>,
 
+    /// Run all requirements listed in the given `requirements.txt` files.
+    #[arg(long, value_parser = parse_maybe_file_path)]
+    pub with_requirements: Vec<Maybe<PathBuf>>,
+
     #[command(flatten)]
     pub installer: ResolverInstallerArgs,