PJAS-466 Tasks being enqueued multiple times during peak hours

[dgjorgjiev-prospective]

The issue seems to be related to the enqueue command during peak hours. It's possible the same task is being enqueued multiple times via boron because we never check if a task is already enqueued. This command takes place every minute, which means if the app is not able to process all the tasks within that minute, it will add them to the queue again. This will generate more retry attempts than specified.

Related PRs:
Boron: https://github.com/cineman/boron/pull/2
PJAS: https://github.com/prospective/pjas/pull/535

[dgjorgjiev-prospective]

Breaking changes:

• src/Driver/DriverInterface.php -> getStatsValue function now has mixed as return type.
• src/Queue.php -> statsGetValue function now has mixed as return type.
• src/ProcessManager.php -> setMaxWorkers function now has self as return type.
• src/ProcessManager.php -> setIdleWait function now has self as return type.
• src/ProcessManager.php -> work function now has void as return type.
• src/Mutex.php -> safeExec function now has void as return type.
• src/Mutex.php -> unlock function now has void as return type.
• src/Mutex.php -> lock function now has void as return type.