feat: Search terms for use, while, and range (#5093) (#10265)

# Description

Add search terms to the commands: `use` ("environment", "import"),
`while` ("loop"), and `range` ("filter", "head", "tail").

# Tests + Formatting
All completed successfully.

---------

Co-authored-by: Stefan Holderbach <sholderbach@users.noreply.github.com>

crates/nu-cmd-lang/src/core_commands/use_.rs

@@ -30,6 +30,10 @@ impl Command for Use {
             .category(Category::Core)
     }
 
+    fn search_terms(&self) -> Vec<&str> {
+        vec!["module", "import", "include", "scope"]
+    }
+
     fn extra_usage(&self) -> &str {
         r#"See `help std` for the standard library module.
 See `help modules` to list all available modules.

crates/nu-cmd-lang/src/core_commands/while_.rs

@@ -30,6 +30,10 @@ impl Command for While {
             .category(Category::Core)
     }
 
+    fn search_terms(&self) -> Vec<&str> {
+        vec!["loop"]
+    }
+
     fn run(
         &self,
         engine_state: &EngineState,

crates/nu-command/src/filters/range.rs

@@ -33,6 +33,10 @@ impl Command for Range {
         "Return only the selected rows."
     }
 
+    fn search_terms(&self) -> Vec<&str> {
+        vec!["filter", "head", "tail"]
+    }
+
     fn examples(&self) -> Vec<Example> {
         vec![
             Example {