Speed up tight loop benchmarks (#8609)

# Description

This does a few speedups for tight loops:
* Caches the DeclId for `table` so we don't look it up. This means users
can't easily replace the default one, we might want to talk about this
tradeoff. The lookup for finding `table` in a tight loop is currently
pretty heavy. Might be another way to speed this up.
* `table` no longer pre-calculates the width. Instead, it only
calculates the width when printing a table or record.
* Use more efficient way of collecting the block of each loop
* When printing output, only get the config when needed

Combined, this drops the runtime from a million loop tight iteration
from 1sec 8ms to 236ms.

# User-Facing Changes

_(List of all changes that impact the user experience here. This helps
us keep track of breaking changes.)_

# Tests + Formatting

Don't forget to add tests that cover your changes.

Make sure you've run and fixed any issues with these commands:

- `cargo fmt --all -- --check` to check standard code formatting (`cargo
fmt --all` applies these changes)
- `cargo clippy --workspace -- -D warnings -D clippy::unwrap_used -A
clippy::needless_collect` to check that you're using the standard code
style
- `cargo test --workspace` to check that all tests pass

> **Note**
> from `nushell` you can also use the `toolkit` as follows
> ```bash
> use toolkit.nu # or use an `env_change` hook to activate it
automatically
> toolkit check pr
> ```

# After Submitting

If your PR had any user-facing changes, update [the
documentation](https://github.com/nushell/nushell.github.io) after the
PR is merged, if necessary. This will help us keep the docs up to date.

crates/nu-command/src/default_context.rs

@@ -462,5 +462,9 @@ pub fn create_default_context() -> EngineState {
         eprintln!("Error creating default context: {err:?}");
     }
 
+    // Cache the table decl id so we don't have to look it up later
+    let table_decl_id = engine_state.find_decl("table".as_bytes(), &[]);
+    engine_state.table_decl_id = table_decl_id;
+
     engine_state
 }

crates/nu-command/src/viewers/table.rs

@@ -110,7 +110,6 @@ impl Command for Table {
         let list: bool = call.has_flag("list");
 
         let width_param: Option<i64> = call.get_flag(engine_state, stack, "width")?;
-        let term_width = get_width_param(width_param);
 
         let expand: bool = call.has_flag("expand");
         let expand_limit: Option<usize> = call.get_flag(engine_state, stack, "expand-deep")?;
@@ -152,7 +151,7 @@ impl Command for Table {
             input,
             row_offset,
             table_view,
-            term_width,
+            width_param,
         )
     }
 
@@ -232,7 +231,7 @@ fn handle_table_command(
     input: PipelineData,
     row_offset: usize,
     table_view: TableView,
-    term_width: usize,
+    term_width: Option<i64>,
 ) -> Result<PipelineData, ShellError> {
     let ctrlc = engine_state.ctrlc.clone();
     let config = engine_state.get_config();
@@ -278,18 +277,22 @@ fn handle_table_command(
             ctrlc,
             metadata,
         ),
-        PipelineData::Value(Value::Record { cols, vals, span }, ..) => handle_record(
-            cols,
-            vals,
-            span,
-            engine_state,
-            stack,
-            call,
-            table_view,
-            term_width,
-            ctrlc,
-            config,
-        ),
+        PipelineData::Value(Value::Record { cols, vals, span }, ..) => {
+            let term_width = get_width_param(term_width);
+
+            handle_record(
+                cols,
+                vals,
+                span,
+                engine_state,
+                stack,
+                call,
+                table_view,
+                term_width,
+                ctrlc,
+                config,
+            )
+        }
         PipelineData::Value(Value::LazyRecord { val, .. }, ..) => {
             let collected = val.collect()?.into_pipeline_data();
             handle_table_command(