Update config directly at assignment (#13332)

# Description

Allows `Stack` to have a modified local `Config`, which is updated
immediately when `$env.config` is assigned to. This means that even
within a script, commands that come after `$env.config` changes will
always see those changes in `Stack::get_config()`.

Also fixed a lot of cases where `engine_state.get_config()` was used
even when `Stack` was available.

Closes #13324.

# User-Facing Changes
- Config changes apply immediately after the assignment is executed,
rather than whenever config is read by a command that needs it.
- Potentially slower performance when executing a lot of lines that
change `$env.config` one after another. Recommended to get `$env.config`
into a `mut` variable first and do modifications, then assign it back.
- Much faster performance when executing a script that made
modifications to `$env.config`, as the changes are only parsed once.

# Tests + Formatting
All passing.

# After Submitting
- [ ] release notes

crates/nu-command/src/platform/ansi/ansi_.rs

@@ -653,7 +653,7 @@ Operating system commands:
         let list: bool = call.has_flag(engine_state, stack, "list")?;
         let escape: bool = call.has_flag(engine_state, stack, "escape")?;
         let osc: bool = call.has_flag(engine_state, stack, "osc")?;
-        let use_ansi_coloring = engine_state.get_config().use_ansi_coloring;
+        let use_ansi_coloring = stack.get_config(engine_state).use_ansi_coloring;
 
         if list {
             return Ok(generate_ansi_code_list(

crates/nu-command/src/platform/ansi/strip.rs

@@ -1,10 +1,12 @@
+use std::sync::Arc;
+
 use nu_cmd_base::input_handler::{operate, CmdArgument};
 use nu_engine::command_prelude::*;
 use nu_protocol::Config;
 
 pub struct Arguments {
     cell_paths: Option<Vec<CellPath>>,
-    config: Config,
+    config: Arc<Config>,
 }
 
 impl CmdArgument for Arguments {
@@ -51,11 +53,8 @@ impl Command for SubCommand {
     ) -> Result<PipelineData, ShellError> {
         let cell_paths: Vec<CellPath> = call.rest(engine_state, stack, 1)?;
         let cell_paths = (!cell_paths.is_empty()).then_some(cell_paths);
-        let config = engine_state.get_config();
-        let args = Arguments {
-            cell_paths,
-            config: config.clone(),
-        };
+        let config = stack.get_config(engine_state);
+        let args = Arguments { cell_paths, config };
         operate(action, args, input, call.head, engine_state.signals())
     }
 

crates/nu-command/src/platform/input/list.rs

@@ -79,6 +79,7 @@ impl Command for InputList {
         let fuzzy = call.has_flag(engine_state, stack, "fuzzy")?;
         let index = call.has_flag(engine_state, stack, "index")?;
         let display_path: Option<CellPath> = call.get_flag(engine_state, stack, "display")?;
+        let config = stack.get_config(engine_state);
 
         let options: Vec<Options> = match input {
             PipelineData::Value(Value::Range { .. }, ..)
@@ -89,9 +90,9 @@ impl Command for InputList {
                     let display_value = if let Some(ref cellpath) = display_path {
                         val.clone()
                             .follow_cell_path(&cellpath.members, false)?
-                            .to_expanded_string(", ", engine_state.get_config())
+                            .to_expanded_string(", ", &config)
                     } else {
-                        val.to_expanded_string(", ", engine_state.get_config())
+                        val.to_expanded_string(", ", &config)
                     };
                     Ok(Options {
                         name: display_value,