Add code to check plugin license status and download link

[AltamashShaikh]

Description:

Adds code to check plugin wise license status and download link Fixes: PG-3814, #PG-3770

Review

• [ ] Functional review done
• [ ] Potential edge cases thought about (behavior of the code with strange input, with strange internal state or possible interactions with other Matomo subsystems)
• [ ] Usability review done (is anything maybe unclear or think about anything that would cause people to reach out to support)
• [ ] Security review done
• [ ] Wording review done
• [ ] Code review done
• [ ] Tests were added if useful/possible
• [ ] Reviewed for breaking changes
• [ ] Developer changelog updated if needed
• [ ] Documentation added if needed
• [ ] Existing documentation updated if needed

[AltamashShaikh]

@michalkleiner @sgiehl Do you think this PR changes are good ? I can think of adding tests around it, if this looks good to you both

[AltamashShaikh]

@sgiehl @michalkleiner Can you review the PR again and merge if all looks good