feat: Adds generate-config command.

Sources/CliClient/FileClient.swift

@@ -18,6 +18,7 @@ public struct FileClient: Sendable {
   public var homeDir: @Sendable () -> URL = { URL(string: "~/")! }
   public var isDirectory: @Sendable (URL) -> Bool = { _ in false }
   public var isReadable: @Sendable (URL) -> Bool = { _ in false }
+  public var write: @Sendable (String, Data) throws -> Void
 }
 
 @_spi(Internal)
@@ -31,7 +32,10 @@ extension FileClient: DependencyKey {
       loadFile: { try client.loadFile(at: $0, into: &$1, decoder: $2) },
       homeDir: { client.homeDir },
       isDirectory: { client.isDirectory(url: $0) },
-      isReadable: { client.isReadable(url: $0) }
+      isReadable: { client.isReadable(url: $0) },
+      write: { path, data in
+        try data.write(to: URL(filePath: path))
+      }
     )
   }