feat: Registers telemetry events

[isaacsanders]

Fixes #492

iex(1)> :telemetry_registry.discover_all(:quantum)
:ok
iex(2)> :telemetry_registry.spannable_events()
[{[:quantum, :job], [:start, :stop, :exception]}]
iex(3)> :telemetry_registry.list_events
[
  {[:quantum, :job, :add], Quantum.JobBroadcaster,
   %{
     description: "dispatched when a job is added",
     measurements: "%{}",
     metadata: "%{job: Quantum.Job.t(), scheduler: atom()}"
   }},
  {[:quantum, :job, :delete], Quantum.JobBroadcaster,
   %{
     description: "dispatched when a job is deleted",
     measurements: "%{}",
     metadata: "%{job: Quantum.Job.t(), scheduler: atom()}"
   }},
  {[:quantum, :job, :exception], Quantum.Executor,
   %{
     description: "dispatched on job execution fail",
     measurements: "%{duration: integer()}",
     metadata: "%{telemetry_span_context: term(), job: Quantum.Job.t(), node: Node.t(), scheduler: atom(), kind: :throw | :error | :exit, reason: term(), stacktrace: list()}"
   }},
  {[:quantum, :job, :start], Quantum.Executor,
   %{
     description: "dispatched on job execution start",
     measurements: "%{system_time: integer()}",
     metadata: "%{telemetry_span_context: term(), job: Quantum.Job.t(), node: Node.t(), scheduler: atom()}"
   }},
  {[:quantum, :job, :stop], Quantum.Executor,
   %{
     description: "dispatched on job execution end",
     measurements: "%{duration: integer()}",
     metadata: "%{telemetry_span_context: term(), job: Quantum.Job.t(), node: Node.t(), scheduler: atom(), result: term()}"
   }},
  {[:quantum, :job, :update], Quantum.JobBroadcaster,
   %{
     description: "dispatched when a job is updated",
     measurements: "%{}",
     metadata: "%{job: Quantum.Job.t(), scheduler: atom()}"
   }}
]

[coveralls]

Pull Request Test Coverage Report for Build 9215c94f941991cc7dec5bc56142d8693a46635b-PR-493

• 0 of 0 changed or added relevant lines in 0 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage remained the same at 86.19%

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Totals
Change from base Build 1387b539ca66ec1b4fd2da6f3bb22554e88b590f:	0.0%
Covered Lines:	362
Relevant Lines:	420

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💛 - Coveralls

[maennchen]

@isaacsanders Thanks!

I was wondering, if it would be better to move the events into a module that has a @moduledoc and include telemetry_docs() in there. What do you think?

Should we add something similar to your example above to the tests?

[isaacsanders]

how do you like this newest set of changes?

[maennchen]

@isaacsanders Do you think that we should have a separate module for the Telemetry Docs? I think it would also be fine to add it directly to the Quantum module itself. What do you think?

[maennchen]

@isaacsanders Awesome, thank you 🙂