fix: hb_ao:get_many optimization

[jfrain99]

Calling hb_ao:get with {as, Device, Msg} makes an expensive call to hb_ao:set. In multiple places, we are making multiple of these types of calls in a row, making duplicate expensive requests. Introduces hb_ao:get_many, which takes multiple paths/defaults and only makes one call to hb_ao:set

[samcamwilliams]

Thanks for this @jfrain99 . What is the effect size of the improvement here please? I think we might be better off just thinking through how we can set the device key in a much more efficient way on the normal resolve and get paths.