Feature Request: Show footnote content when hovering on it

[SeptemberHX]

For example, we have:

Test items[^foot]

xxxxxxx

[^foot]: This is a footnote

When we hover on [^foot], a tooltip with This is a footnote will appear.

It should be the same as https://github.com/Zettlr/Zettlr/blob/develop/source/common/modules/markdown-editor/hooks/footnotes.ts