Add tracing support to sentry-delayed_job

[fsateler]

Fixes #1312

[codecov-commenter]

Codecov Report

Merging #1482 (dcfeb63) into master (fac1db6) will increase coverage by 0.56%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master    #1482      +/-   ##
==========================================
+ Coverage   98.20%   98.76%   +0.56%     
==========================================
  Files         218      123      -95     
  Lines       10467     6716    -3751     
==========================================
- Hits        10279     6633    -3646     
+ Misses        188       83     -105     

Impacted Files	Coverage Δ
...entry-delayed_job/lib/sentry/delayed_job/plugin.rb	100.00% <100.00%> (ø)
sentry-delayed_job/spec/sentry/delayed_job_spec.rb	100.00% <100.00%> (ø)
sentry-rails/app/jobs/sentry/send_event_job.rb	72.22% <0.00%> (-5.56%)	⬇️
sentry-raven/spec/raven/interface_spec.rb
sentry-raven/lib/raven/interfaces/stack_trace.rb
...try-raven/lib/sentry-raven-without-integrations.rb
sentry-raven/lib/raven/utils/real_ip.rb
sentry-raven/lib/raven/transports/http.rb
sentry-raven/lib/raven/utils/context_filter.rb
.../lib/raven/integrations/rails/backtrace_cleaner.rb
... and 88 more

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[st0012]

hey thanks a lot for adding this 👍
just left some comments for polishing. I think you also need to rebase the branch and resolve the conflict in order to start the build.

[fsateler]

Done!

[st0012]

Thanks for implementing this 😄