Remove dfr from dataframe commands (#5760)

* input and output tests

* input and output types for dfr

* expression converter

* remove deprecated command

* correct expressions

* cargo clippy

* identifier for ls

* cargo clippy

* type for head and tail expression

* modify full cell path if block

crates/nu-command/src/deprecated/dataframe.rs

@@ -1,36 +0,0 @@
-use nu_protocol::{
-    ast::Call,
-    engine::{Command, EngineState, Stack},
-    Category, PipelineData, Signature,
-};
-
-#[derive(Clone)]
-pub struct DataframeDeprecated;
-
-impl Command for DataframeDeprecated {
-    fn name(&self) -> &str {
-        "dataframe"
-    }
-
-    fn signature(&self) -> Signature {
-        Signature::build(self.name()).category(Category::Deprecated)
-    }
-
-    fn usage(&self) -> &str {
-        "Deprecated command"
-    }
-
-    fn run(
-        &self,
-        _engine_state: &EngineState,
-        _stack: &mut Stack,
-        call: &Call,
-        _input: PipelineData,
-    ) -> Result<nu_protocol::PipelineData, nu_protocol::ShellError> {
-        Err(nu_protocol::ShellError::DeprecatedCommand(
-            self.name().to_string(),
-            "dfr".to_string(),
-            call.head,
-        ))
-    }
-}

crates/nu-command/src/deprecated/mod.rs

@@ -21,9 +21,3 @@ pub use str_decimal::StrDecimalDeprecated;
 pub use str_find_replace::StrFindReplaceDeprecated;
 pub use str_int::StrIntDeprecated;
 pub use unalias::UnaliasDeprecated;
-
-#[cfg(feature = "dataframe")]
-mod dataframe;
-
-#[cfg(feature = "dataframe")]
-pub use dataframe::DataframeDeprecated;