feat: JS type and pattern handles

TypeNode::kind and Pat::kind map oxc's types and binding patterns to
bun's TypeKind and PatKind, with TupleElem, Mapped, PatProp and
PatElem. Parentheses around a type are skipped like those around an
expression. Where oxc has no node for one of bun's (a plain tuple
element, an array pattern element, a mapped type's parameter), the
handle takes the id of the node in its place; ty.rs and pat.rs say
where.