Hardcoded data for sc2::Ability cooldowns, keep track of used_cooldown_abilities

[ImpulseCloud]

Is your feature request related to a particular part of the API (function, class, functor)? If so, specify it.
sc2::AbilityData should include ability_cooldown if it has a cooldown.

Is your feature request related to a problem? Please describe.
API does not list a unit's abilities on cooldown, and AbilityData does not even list the ability_cooldown amount,

Describe the solution you'd like
Need a hardcoded map<pair<ability_id, cooldown_amount>> (or unordered_map), and insert into sc2::AbilityData possibly. Then, can use a separate used_abilities map to keep track of used abilities and when the cooldown should be finished. Perhaps capture UnitCommands that match a filter for abilities_with_cooldowns and set when_cooldown_finished for that Unit.
std::map<std::pair<unit_id, std::vector<ability_id, when_cooldown_finished>> used_abilities;

Describe alternatives you've considered
In sc2::Unit, could add Used_Abilities vector of <ability_id, when_cooldown_finished>. (similar to Buffs) Could share a reference or shared_ptr with the sc2api map of Used_Abilities.

Additional context
This could be tracked manually in bots (per ability), but would be more useful for the API to have the ability to track these wholesale.