feat(connector): [Braintree] implement dispute webhook (#2031)
Co-authored-by: Prasunna Soppa <prasunna.soppa@juspay.in>
Co-authored-by: Arjun Karthik <m.arjunkarthik@gmail.com>
Co-authored-by: Sai Harsha Vardhan <56996463+sai-harsha-vardhan@users.noreply.github.com>