SLING-9389: Distribution Event Properties enhanced for holding queue item creation time stamp

[harshchiki]

In general,

• Improvement aims at adding the queue item creation time, essentially when the the item was creation for the first time, and enqueue into the queue.
• The purpose to get this detail is to be able to capture metrics at the consumer level. The consumers could have an event handler, which can capture the duration which turns out to be (NOW MINUS queue item creation time thrown in the distribution event package); NOW being the current time in the event handler (consumer).

@tmaret , @cschneider , kindly review.

@actinium15 , kindly review this PR - its identical to #2. I had to raise this new one to resolve some merge conflicts/issues.

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The version of Java (1.8.0_252) you have used to run this analysis is deprecated and we will stop accepting it from October 2020. Please update to at least Java 11.
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