feat(es_extended) Add ESX.Await function

[Zykem]

This PR adds a utility function, ESX.Await, to simplify waiting for a condition without the need for manual loops. It checks a condition repeatedly until it’s met or the timeout is reached.

Example usage:

local networkId = ESX.AwaitServerCallback('spawnVehicle')

local function awaitExistence()
    return NetworkDoesEntityExistWithNetworkId(networkId)
end

-- timeElapsed value in MS
local success, timeElapsed = ESX.Await(awaitExistence, 'Timed out :(', 3000)

-- we can now mess with the vehicle spawned server-side on the client-side

[Kenshiin13]

I will do some testing after the latest requested changes have been implemented and merge this. Thank you!

[Kenshiin13]

Thanks!