feat: now html2canvas-pro is dynamically imported only when needed and then cached

[nickytonline]

Description

Now html2canvas-pro is dynamically imported only when needed and then cached, saving about a 45kb of JS loading on any page that uses it on initial page load.

Related Tickets & Documents

Closes #4033 Relates to #3975

Mobile & Desktop Screenshots/Recordings

Steps to QA

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5. A toast message says the image was copied.
6. Paste the image in for example GitHub markdown, socials, Slack etc.
7. The image of the given stat/graph appears.

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