Add SLA and Current Queue state for RT API

[trosel]

SLA takes a timeframe and group of buckets like 5,10,15 seconds

SLA = https://<domain>/operations/api/account/{accountID}/sla?timeframe=<timeframe in minutes>&skillIds=<skillIDs>&groupIds=<groupIds>&histogram=<histogram bucket list>&v=<version>

Current queue state just takes the skillIds and gives the current queue at that exact moment

Current Queue = https://<domain>/operations/api/account/{accountID}/queuestate?skillIds=<ski llIDs>&v=<version>

I think each of these should be methods that are separate from the real_time API call.