Deserialization and outputstream math commands (#3315)

* Output error when ls into a file without permission

* math sqrt

* added test to check fails when ls into prohibited dir

* fix lint

* math sqrt with tests and doc

* trigger wasm build

* Update filesystem_shell.rs

* converted math commands to outputstream and new method for arg evaluation

* fmt

* clippy

Co-authored-by: Jonathan Turner <jonathandturner@users.noreply.github.com>

crates/nu-command/src/commands/math/avg.rs

@@ -27,7 +27,7 @@ impl WholeStreamCommand for SubCommand {
         "Finds the average of a list of numbers or tables"
     }
 
-    fn run_with_actions(&self, args: CommandArgs) -> Result<ActionStream, ShellError> {
+    fn run(&self, args: CommandArgs) -> Result<OutputStream, ShellError> {
         run_with_function(args, average)
     }