Filter out redundant event/payload from breadcrumbs logger

[st0012]

• Removes potentially large payload from breadcrumbs. They're likely to make the event exceed size limit and be rejected by Sentry.
• Ignores Rails' internal instrumentation events (names start with !)

[codecov-io]

Codecov Report

Merging #1222 (5f202df) into master (40a63e7) will increase coverage by 0.89%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master    #1222      +/-   ##
==========================================
+ Coverage   97.91%   98.80%   +0.89%     
==========================================
  Files         193       28     -165     
  Lines        8250      755    -7495     
==========================================
- Hits         8078      746    -7332     
+ Misses        172        9     -163     

Impacted Files	Coverage Δ
...b/sentry/rails/breadcrumb/active_support_logger.rb	100.00% <100.00%> (ø)
...ec/sentry/rails/active_support_breadcrumbs_spec.rb	100.00% <100.00%> (ø)
sentry-ruby/lib/sentry/breadcrumb.rb
sentry-raven/lib/raven/configuration.rb
sentry-ruby/spec/sentry/client_spec.rb
...ec/raven/processors/sanitizedata_processor_spec.rb
...ven/spec/raven/utils/exception_cause_chain_spec.rb
...try-ruby/lib/sentry/interfaces/single_exception.rb
...y-raven/lib/raven/integrations/rails/active_job.rb
sentry-raven/spec/raven/integrations/rake_spec.rb
... and 157 more

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