WIP 6.0 major

[sl0thentr0py]

• Drop async configuration #1894
• Migrate from to_hash to to_h #2351
• Add before_send_check_in #2703
• Archive sentry-raven #2708
• Remove stacktrace trimming from the SDK #2714
• Default config.enabled_environments to nil instead of [] #2716
• Remove :monotonic_active_support_logger #2717
• Add config.trace_ignore_status_codes to control which status codes don't get traced #2725
• Don't send client reports for profiles if profiling is disabled #2728
• Remove Sentry::Metrics and config.metrics and all metrics related code #2729
• Remove deprecated config.capture_exception_frame_locals #2730
• Remove deprecated config.enable_tracing #2731
• Remove deprecated config.logger #2732
• Remove deprecated Sentry::Rails::Tracing::ActionControllerSubscriber #2733
• Remove Transaction deprecations #2736
• Remove hub from Transaction#initialize #2739
• Remove deprecated Event#configuration #2740
• Remove deprecated client methods #2741
• Bump required_ruby_version to 2.7 #2743
• Add new config.profiles_sample_interval #2745
• Move examples out of SDK #2746

[github-actions]

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Please add an entry to CHANGELOG.md to the "Unreleased" section. Make sure the entry includes this PR's number.

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## Unreleased

### Features

- WIP 6.0 major ([#2352](https://github.com/getsentry/sentry-ruby/pull/2352))

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Generated by 🚫 dangerJS against 4d9c5d1

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 97.20%. Comparing base (11b8eaf) to head (4d9c5d1).
⚠️ Report is 1 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #2352      +/-   ##
==========================================
- Coverage   97.28%   97.20%   -0.09%     
==========================================
  Files         144      130      -14     
  Lines        5671     5221     -450     
==========================================
- Hits         5517     5075     -442     
+ Misses        154      146       -8     

Components	Coverage Δ
sentry-ruby	97.49% <ø> (-0.28%)	⬇️
sentry-rails	96.74% <ø> (+1.26%)	⬆️
sentry-sidekiq	95.05% <ø> (-1.53%)	⬇️
sentry-resque	94.44% <ø> (ø)
sentry-delayed_job	94.68% <ø> (ø)
sentry-opentelemetry	99.31% <100.00%> (ø)

Files with missing lines	Coverage Δ
...entelemetry/lib/sentry/opentelemetry/propagator.rb	97.05% <100.00%> (ø)

... and 49 files with indirect coverage changes

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