Span ID Refactor (Step 2): Make Call SpanId-friendly (#13268)

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# Description
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Part of https://github.com/nushell/nushell/issues/12963, step 2.

This PR refactors Call and related argument structures to remove their
dependency on `Expression::span` which will be removed in the future.

# User-Facing Changes
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Should be none. If you see some error messages that look broken, please
report.

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crates/nu-cli/src/commands/keybindings_list.rs

@@ -62,7 +62,7 @@ impl Command for KeybindingsList {
                 .collect()
         } else {
             call.named_iter()
-                .flat_map(|(argument, _, _)| get_records(argument.item.as_str(), call.head))
+                .flat_map(|(argument, _, _, _)| get_records(argument.item.as_str(), call.head))
                 .collect()
         };
 

crates/nu-cli/src/completions/custom_completions.rs

@@ -7,7 +7,7 @@ use nu_protocol::{
     ast::{Argument, Call, Expr, Expression},
     debugger::WithoutDebug,
     engine::{Stack, StateWorkingSet},
-    PipelineData, Span, Type, Value,
+    PipelineData, Span, Spanned, Type, Value,
 };
 use nu_utils::IgnoreCaseExt;
 use std::collections::HashMap;
@@ -51,18 +51,21 @@ impl Completer for CustomCompletion {
             &Call {
                 decl_id: self.decl_id,
                 head: span,
-                arguments: vec![
-                    Argument::Positional(Expression::new_unknown(
-                        Expr::String(self.line.clone()),
-                        Span::unknown(),
-                        Type::String,
-                    )),
-                    Argument::Positional(Expression::new_unknown(
-                        Expr::Int(line_pos as i64),
-                        Span::unknown(),
-                        Type::Int,
-                    )),
-                ],
+                arguments: Spanned {
+                    item: vec![
+                        Argument::Positional(Expression::new_unknown(
+                            Expr::String(self.line.clone()),
+                            Span::unknown(),
+                            Type::String,
+                        )),
+                        Argument::Positional(Expression::new_unknown(
+                            Expr::Int(line_pos as i64),
+                            Span::unknown(),
+                            Type::Int,
+                        )),
+                    ],
+                    span: Span::unknown(),
+                },
                 parser_info: HashMap::new(),
             },
             PipelineData::empty(),

crates/nu-cli/src/syntax_highlight.rs

@@ -400,7 +400,7 @@ fn find_matching_block_end_in_expr(
                 }
             }
 
-            Expr::Call(call) => call.arguments.iter().find_map(|arg| {
+            Expr::Call(call) => call.arguments.item.iter().find_map(|arg| {
                 arg.expr().and_then(|expr| {
                     find_matching_block_end_in_expr(
                         line,