Add g_tls_connection_get_channel_binding_data call and enums
- Add g_tls_connection_get_channel_binding_data API call
- Add get_binding_data method to GTlsConnection class
- Add GTlsChannelBindingType enum with tls-unique, tls-server-end-point and tls-scram-exporter types
- Add GTlsChannelBindingError enum and G_TLS_CB_ERROR quark