Introduce compact number formatting and use it for MultiSites KPIs

[sgiehl]

Description:

• Implements compact number and currency formatting for PHP and JavaScript
• Imports the required formats from CLDR
• Use new compact formatting for Marketplace plugin cards
• Use new compact formatting for All Websites Dashboard KPIs

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