[PropertiesUtils] Add live_delay property

[CastagnaIT]

Description

Add live_delay property
to add a way to set and/or override the live delay from the live edge (e.g. DASH have suggestedPresentationDelay tag to set it but HLS does not have this kind of property)

Motivation and context

this is a temporary workaround to fix #1132 since a complete solution require deeper changes

How has this been tested?

used sample live link from issue
users confirmed

Screenshots (if appropriate):

Types of change

• Bug fix (non-breaking change which fixes an issue)
• Clean up (non-breaking change which removes non-working, unmaintained functionality)
• Improvement (non-breaking change which improves existing functionality)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that will cause existing functionality to change)
• Cosmetic change (non-breaking change that doesn't touch code)
• None of the above (please explain below)

Checklist:

• I have read the Contributing document
• My code follows the Code Guidelines of this project
• My change requires a change to the Wiki documentation
• I have updated the documentation accordingly