Allow different names for ...rest (#3954)

* Allow different names for ...rest

* Resolves #3945

* This change requires an explicit name for the rest argument in `WholeStreamCommand`,
  which is why there are so many changed files.

* Remove redundant clone

* Add tests

crates/nu_plugin_inc/src/nu/mod.rs

@@ -31,7 +31,7 @@ impl Plugin for Inc {
                 "increment the patch version (eg 1.2.1 -> 1.2.2)",
                 Some('p'),
             )
-            .rest(SyntaxShape::ColumnPath, "the column(s) to update")
+            .rest("rest", SyntaxShape::ColumnPath, "the column(s) to update")
             .filter())
     }