Add CakeSentry.Queue.* events for Sentry integration

[dereuromark]

Summary

This PR adds events compatible with lordsimal/cakephp-sentry for queue monitoring and tracing, as proposed in LordSimal/cakephp-sentry#43.

Instead of including Sentry-specific code directly in the queue plugin (as in #449), this approach dispatches generic events that the Sentry plugin can listen to:

• CakeSentry.Queue.enqueue: Fired when a job is added to the queue (producer side)
• CakeSentry.Queue.beforeExecute: Fired when a worker begins processing a job (consumer side)
• CakeSentry.Queue.afterExecute: Fired when a job finishes (success or failure)

This enables integration with Sentry's queue monitoring without requiring the queue plugin to depend on the Sentry SDK.

Trace Propagation

For distributed tracing, users can add Sentry trace headers to job data when creating jobs:

$data = ['your_data' => 'here'];

if (class_exists(\Sentry\SentrySdk::class)) {
    $data['_sentry_trace'] = \Sentry\getTraceparent();
    $data['_sentry_baggage'] = \Sentry\getBaggage();
}

$queuedJobsTable->createJob('MyTask', $data);

The queue plugin will pass these headers to the beforeExecute event for trace continuation.

Related Issues

• Missing Sentry features LordSimal/cakephp-sentry#17
• Supersedes Add queue job lifecycle events for monitoring integration #449

Test plan

• Added test for CakeSentry.Queue.enqueue event
• Added test for CakeSentry.Queue.beforeExecute event
• Added test for CakeSentry.Queue.afterExecute success event
• Added test for CakeSentry.Queue.afterExecute failure event
• All 131 tests pass
• Documentation updated in docs/sections/misc.md

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Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 73.65%. Comparing base (e447805) to head (5ec7e88).
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Additional details and impacted files

@@             Coverage Diff              @@
##             master     #452      +/-   ##
============================================
+ Coverage     73.28%   73.65%   +0.37%     
- Complexity      777      778       +1     
============================================
  Files            41       41              
  Lines          2691     2725      +34     
============================================
+ Hits           1972     2007      +35     
+ Misses          719      718       -1     

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[dereuromark]

Closing in favor of #453