Seq for nushell (#2704)

* seq command - WIP

* why, oh why

* works with parameters

* widths should've been optional

* dbg messages

* working. rest had to be first.

* updated so that it outputs a table instead of just strings

* made to work with floats, allowed separator be more than 1 char

* clippy

* fixed tests

* changed terminator help desc

* commit to get ci moving again

crates/nu-cli/src/commands.rs

@@ -98,6 +98,7 @@ pub(crate) mod run_alias;
 pub(crate) mod run_external;
 pub(crate) mod save;
 pub(crate) mod select;
+pub(crate) mod seq;
 pub(crate) mod shells;
 pub(crate) mod shuffle;
 pub(crate) mod size;
@@ -238,6 +239,7 @@ pub(crate) use rm::Remove;
 pub(crate) use run_external::RunExternalCommand;
 pub(crate) use save::Save;
 pub(crate) use select::Select;
+pub(crate) use seq::Seq;
 pub(crate) use shells::Shells;
 pub(crate) use shuffle::Shuffle;
 pub(crate) use size::Size;