Add event processor in OpenTelemetry SpanProcessor to link errors and transactions

[sl0thentr0py]

closes #1975

[codecov-commenter]

Codecov Report

Base: 98.10% // Head: 98.57% // Increases project coverage by +0.46% 🎉

Coverage data is based on head (74c5ef6) compared to base (b73abea).
Patch coverage: 55.55% of modified lines in pull request are covered.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1983      +/-   ##
==========================================
+ Coverage   98.10%   98.57%   +0.46%     
==========================================
  Files          44      157     +113     
  Lines        1798     9920    +8122     
==========================================
+ Hits         1764     9779    +8015     
- Misses         34      141     +107     

Impacted Files	Coverage Δ
...lemetry/lib/sentry/opentelemetry/span_processor.rb	95.55% <55.55%> (ø)
sentry-ruby/spec/sentry/scope/setters_spec.rb	97.52% <0.00%> (ø)
...y/spec/sentry/interfaces/request_interface_spec.rb	99.07% <0.00%> (ø)
sentry-ruby/lib/sentry/net/http.rb	100.00% <0.00%> (ø)
sentry-ruby/spec/sentry/rake_spec.rb	100.00% <0.00%> (ø)
sentry-ruby/lib/sentry-ruby.rb	96.47% <0.00%> (ø)
sentry-delayed_job/lib/sentry-delayed_job.rb	73.33% <0.00%> (ø)
...metry/spec/sentry/opentelemetry/propagator_spec.rb	100.00% <0.00%> (ø)
sentry-ruby/spec/sentry/integrable_spec.rb	100.00% <0.00%> (ø)
...c/sentry/sidekiq/sentry_context_middleware_spec.rb	100.00% <0.00%> (ø)
... and 104 more

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[adinauer]

LGTM