Break up interdependencies of command crates (#9429)

# Description
Make sure that our different crates that contain commands can be
compiled in parallel.
This can under certain circumstances accelerate the compilation with
sufficient multithreading available.

## Details
- Move `help` commands from `nu-cmd-lang` back to `nu-command`
- This also makes sense as the commands are implemented in an
ANSI-terminal specific way
- Make `nu-cmd-lang` only a dev dependency for `nu-command`
- Change context creation helpers for `nu-cmd-extra` and
`nu-cmd-dataframe` to have a consistent api used in
`src/main.rs`:`get_engine_state()`
- `nu-command` now indepedent from `nu-cmd-extra` and `nu-cmd-dataframe`
that are now dependencies of `nu` directly. (change to internal
features)
- Fix tests that previously used `nu-command::create_default_context()`
with replacement functions

## From scratch compilation times:

just debug (dev) build and default features
```
cargo clean --profile dev && cargo build --timings
```

### before

![grafik](https://github.com/nushell/nushell/assets/15833959/e49f1f42-2e53-4a6c-bc23-625b686af1bc)

### after

![grafik](https://github.com/nushell/nushell/assets/15833959/8dec4723-e625-4a86-b91e-e6e808f64726)

# User-Facing Changes
None direct, only change to compilation on multithreaded jobs expected.

# Tests + Formatting
Tests that previously chose to use `nu-command` for their scope will
still use `nu-cmd-lang` + `nu-command` (command list in the granularity
at the time)

crates/nu-command/src/default_context.rs

@@ -1,15 +1,10 @@
 use nu_protocol::engine::{EngineState, StateWorkingSet};
 
-use crate::*;
-#[cfg(feature = "dataframe")]
-use nu_cmd_dataframe::*;
-
-#[cfg(feature = "extra")]
-use nu_cmd_extra::*;
-
-pub fn create_default_context() -> EngineState {
-    let mut engine_state = nu_cmd_lang::create_default_context();
-
+use crate::{
+    help::{HelpAliases, HelpCommands, HelpExterns, HelpModules, HelpOperators},
+    *,
+};
+pub fn add_shell_command_context(mut engine_state: EngineState) -> EngineState {
     let delta = {
         let mut working_set = StateWorkingSet::new(&engine_state);
 
@@ -24,12 +19,6 @@ pub fn create_default_context() -> EngineState {
         // them only accessible if the correct input value category is used with the
         // declaration
 
-        #[cfg(feature = "extra")]
-        add_extra_decls(&mut working_set);
-
-        #[cfg(feature = "dataframe")]
-        add_dataframe_decls(&mut working_set);
-
         // Database-related
         // Adds all related commands to query databases
         #[cfg(feature = "sqlite")]
@@ -138,6 +127,16 @@ pub fn create_default_context() -> EngineState {
             Sys,
         };
 
+        // Help
+        bind_command! {
+            Help,
+            HelpAliases,
+            HelpExterns,
+            HelpCommands,
+            HelpModules,
+            HelpOperators,
+        };
+
         // Debug
         bind_command! {
             Ast,