Move eval_hook to nu-cmd-base (#10146)

I moved hook to *nu_cmd_base* instead of *nu_cli* because it will enable
other developers to continue to use hook even if they decide to write
their on cli or NOT depend on nu-cli

Then they will still have the hook functionality because they can
include nu-cmd-base

crates/nu-command/src/lib.rs

@@ -13,7 +13,6 @@ mod formats;
 mod generators;
 mod hash;
 mod help;
-pub mod hook;
 mod math;
 mod misc;
 mod network;
@@ -44,7 +43,6 @@ pub use formats::*;
 pub use generators::*;
 pub use hash::*;
 pub use help::*;
-pub use hook::*;
 pub use math::*;
 pub use misc::*;
 pub use network::*;