Support ActiveStorage spans in tracing events

[st0012]

This implements and closes #1558

[codecov-commenter]

Codecov Report

Merging #1588 (1513def) into master (4ffa3a2) will decrease coverage by 0.03%.
The diff coverage is 96.11%.

@@            Coverage Diff             @@
##           master    #1588      +/-   ##
==========================================
- Coverage   98.44%   98.41%   -0.04%     
==========================================
  Files         127      129       +2     
  Lines        7095     7192      +97     
==========================================
+ Hits         6985     7078      +93     
- Misses        110      114       +4     

Impacted Files	Coverage Δ
.../sentry/rails/tracing/active_storage_subscriber.rb	92.30% <92.30%> (ø)
sentry-rails/spec/support/test_rails_app/app.rb	97.65% <94.54%> (-2.35%)	⬇️
sentry-rails/lib/sentry/rails/configuration.rb	96.15% <100.00%> (+0.15%)	⬆️
...ls/lib/sentry/rails/tracing/abstract_subscriber.rb	76.66% <100.00%> (+0.80%)	⬆️
...ntry-rails/spec/sentry/rails/configuration_spec.rb	100.00% <100.00%> (ø)
...ry/rails/tracing/active_storage_subscriber_spec.rb	100.00% <100.00%> (ø)

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[georgeclaghorn]

Looking good. 👍

[st0012]

@georgeclaghorn thanks!