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/tests/main.rs

@@ -1,10 +1,16 @@
-use nu_command::create_default_context;
-use nu_protocol::{engine::StateWorkingSet, Category, Span};
+use nu_protocol::{
+    engine::{EngineState, StateWorkingSet},
+    Category, Span,
+};
 use quickcheck_macros::quickcheck;
 
 mod commands;
 mod format_conversions;
 
+fn create_default_context() -> EngineState {
+    nu_command::add_shell_command_context(nu_cmd_lang::create_default_context())
+}
+
 #[quickcheck]
 fn quickcheck_parse(data: String) -> bool {
     let (tokens, err) = nu_parser::lex(data.as_bytes(), 0, b"", b"", true);
@@ -24,7 +30,7 @@ fn quickcheck_parse(data: String) -> bool {
 
 #[test]
 fn signature_name_matches_command_name() {
-    let ctx = crate::create_default_context();
+    let ctx = create_default_context();
     let decls = ctx.get_decls_sorted(true);
     let mut failures = Vec::new();
 
@@ -50,7 +56,7 @@ fn signature_name_matches_command_name() {
 
 #[test]
 fn commands_declare_input_output_types() {
-    let ctx = crate::create_default_context();
+    let ctx = create_default_context();
     let decls = ctx.get_decls_sorted(true);
     let mut failures = Vec::new();