All is a DataFrame (#3812)

* nuframe in its own type in UntaggedValue

* Removed eager dataframe from enum

* Dataframe created from list of values

* Corrected order in dataframe columns

* Returned tag from stream collection

* Removed series from dataframe commands

* Arithmetic operators

* forced push

* forced push

* Replace all command

* String commands

* appending operations with dfs

* Testing suite for dataframes

* Unit test for dataframe commands

* improved equality for dataframes

crates/nu-data/src/base/shape.rs

@@ -131,7 +131,7 @@ impl InlineShape {
             UntaggedValue::Error(_) => InlineShape::Error,
             UntaggedValue::Block(_) => InlineShape::Block,
             #[cfg(feature = "dataframe")]
-            UntaggedValue::DataFrame(_) => InlineShape::DataFrame,
+            UntaggedValue::DataFrame(_) | UntaggedValue::FrameStruct(_) => InlineShape::DataFrame,
         }
     }