Add functions for each Value case (#9736)

# Description
This PR ensures functions exist to extract and create each and every
`Value` case. It also renames `Value::boolean` to `Value::bool` to match
`Value::test_bool`, `Value::as_bool`, and `Value::Bool`. Similarly,
`Value::as_integer` was renamed to `Value::as_int` to be consistent with
`Value::int`, `Value::test_int`, and `Value::Int`. These two renames can
be undone if necessary.

# User-Facing Changes
No user facing changes, but two public functions were renamed which may
affect downstream dependents.

crates/nu-cmd-dataframe/src/dataframe/series/all_false.rs

@@ -88,7 +88,7 @@ fn command(
         )
     })?;
 
-    let value = Value::boolean(!bool.any(), call.head);
+    let value = Value::bool(!bool.any(), call.head);
 
     NuDataFrame::try_from_columns(vec![Column::new("all_false".to_string(), vec![value])])
         .map(|df| PipelineData::Value(NuDataFrame::into_value(df, call.head), None))

crates/nu-cmd-dataframe/src/dataframe/series/all_true.rs

@@ -88,7 +88,7 @@ fn command(
         )
     })?;
 
-    let value = Value::boolean(bool.all(), call.head);
+    let value = Value::bool(bool.all(), call.head);
 
     NuDataFrame::try_from_columns(vec![Column::new("all_true".to_string(), vec![value])])
         .map(|df| PipelineData::Value(NuDataFrame::into_value(df, call.head), None))