Better error handling using do (#5890)

* adds `capture-errors` flag for `do`

* adds `get-type` core command to get type

* fmt

* add tests in example

* fmt

* fix tests

* manually revert previous changes related to `get-type`

* adds method to check for error name using `into string`

* fix clippy

crates/nu-parser/src/parser.rs

@@ -2670,6 +2670,7 @@ pub fn parse_shape_name(
         b"record" => SyntaxShape::Record,
         b"list" => SyntaxShape::List(Box::new(SyntaxShape::Any)),
         b"table" => SyntaxShape::Table,
+        b"error" => SyntaxShape::Error,
         _ => {
             if bytes.contains(&b'@') {
                 let str = String::from_utf8_lossy(bytes);