Add an option to delay job execution when adding to the queue

[michalsn]

Description
This PR adds an option to delay job execution when adding to the queue.

Checklist:

• Securely signed commits
• Component(s) with PHPDoc blocks, only if necessary or adds value
• Unit testing, with >80% coverage
• User guide updated
• Conforms to style guide

[coveralls]

Pull Request Test Coverage Report for Build 12841840146

Details

• 16 of 16 (100.0%) changed or added relevant lines in 6 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage increased (+0.1%) to 90.635%

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Totals
Change from base Build 12828678451:	0.1%
Covered Lines:	542
Relevant Lines:	598

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💛 - Coveralls

[michalsn]

Thank you @paulbalandan and @samsonasik!