Add command_prelude module (#12291)

# Description
When implementing a `Command`, one must also import all the types
present in the function signatures for `Command`. This makes it so that
we often import the same set of types in each command implementation
file. E.g., something like this:
```rust
use nu_protocol::ast::Call;
use nu_protocol::engine::{Command, EngineState, Stack};
use nu_protocol::{
    record, Category, Example, IntoInterruptiblePipelineData, IntoPipelineData, PipelineData,
    ShellError, Signature, Span, Type, Value,
};
```

This PR adds the `nu_engine::command_prelude` module which contains the
necessary and commonly used types to implement a `Command`:
```rust
// command_prelude.rs
pub use crate::CallExt;
pub use nu_protocol::{
    ast::{Call, CellPath},
    engine::{Command, EngineState, Stack},
    record, Category, Example, IntoInterruptiblePipelineData, IntoPipelineData, IntoSpanned,
    PipelineData, Record, ShellError, Signature, Span, Spanned, SyntaxShape, Type, Value,
};
```

This should reduce the boilerplate needed to implement a command and
also gives us a place to track the breadth of the `Command` API. I tried
to be conservative with what went into the prelude modules, since it
might be hard/annoying to remove items from the prelude in the future.
Let me know if something should be included or excluded.

crates/nu-cmd-base/src/hook.rs

@@ -1,13 +1,14 @@
-use std::sync::Arc;
-
 use crate::util::get_guaranteed_cwd;
 use miette::Result;
 use nu_engine::{eval_block, eval_block_with_early_return};
 use nu_parser::parse;
-use nu_protocol::cli_error::{report_error, report_error_new};
-use nu_protocol::debugger::WithoutDebug;
-use nu_protocol::engine::{EngineState, Stack, StateWorkingSet};
-use nu_protocol::{BlockId, PipelineData, PositionalArg, ShellError, Span, Type, Value, VarId};
+use nu_protocol::{
+    cli_error::{report_error, report_error_new},
+    debugger::WithoutDebug,
+    engine::{EngineState, Stack, StateWorkingSet},
+    BlockId, PipelineData, PositionalArg, ShellError, Span, Type, Value, VarId,
+};
+use std::sync::Arc;
 
 pub fn eval_env_change_hook(
     env_change_hook: Option<Value>,

crates/nu-cmd-base/src/input_handler.rs

@@ -1,7 +1,5 @@
-use nu_protocol::ast::CellPath;
-use nu_protocol::{PipelineData, ShellError, Span, Value};
-use std::sync::atomic::AtomicBool;
-use std::sync::Arc;
+use nu_protocol::{ast::CellPath, PipelineData, ShellError, Span, Value};
+use std::sync::{atomic::AtomicBool, Arc};
 
 pub trait CmdArgument {
     fn take_cell_paths(&mut self) -> Option<Vec<CellPath>>;

crates/nu-cmd-base/src/util.rs

@@ -1,8 +1,7 @@
-use nu_protocol::report_error;
 use nu_protocol::{
     ast::RangeInclusion,
     engine::{EngineState, Stack, StateWorkingSet},
-    Range, ShellError, Span, Value,
+    report_error, Range, ShellError, Span, Value,
 };
 use std::path::PathBuf;