Stdout/Stderr redirection (#7185)

This adds new pipeline connectors called out> and err> which redirect either stdout or stderr to a file. You can also use out+err> (or err+out>) to redirect both streams into a file.

crates/nu-command/tests/commands/mod.rs

@@ -57,6 +57,7 @@ mod print;
 mod query;
 mod random;
 mod range;
+mod redirection;
 mod reduce;
 mod reject;
 mod rename;