Macro dominator_helpers::make_ts_event

macro_rules! make_ts_event {
    ($literal:literal, $data:ident) => { ... };
}

takes a literal and an ident and does the following:

1. impls what’s needed for dominator
2. calls make_custom_event_serde! to enable the .data() helper (also for dominator)
3. creates a function for testing the round-tripping from typescript (when ts_test feature is enabled)