Support types in the standard library (#5651)

* Parse an unparse type decls (and refactor impl attributes slightly)

Signed-off-by: Nick Cameron <nrc@ncameron.org>

* Remove special treatment of geometric types from parser and executor

Signed-off-by: Nick Cameron <nrc@ncameron.org>

* Generate docs for std types

Signed-off-by: Nick Cameron <nrc@ncameron.org>

* Hover tool-tips for types and fixup the frontend

Signed-off-by: Nick Cameron <nrc@ncameron.org>

* Fixes

Signed-off-by: Nick Cameron <nrc@ncameron.org>

---------

Signed-off-by: Nick Cameron <nrc@ncameron.org>

rust/kcl-lib/src/walk/ast_visitor.rs

@@ -109,6 +109,7 @@ impl<'tree> Visitable<'tree> for Node<'tree> {
                 children
             }
             Node::VariableDeclaration(n) => vec![(&n.declaration).into()],
+            Node::TypeDeclaration(n) => vec![(&n.name).into()],
             Node::ReturnStatement(n) => {
                 vec![(&n.argument).into()]
             }