API: Method to add link and have it parsed into `metadataCache`

[ush]

This is also related to this feature request. We surely need some means to modify how metadata is indexed.

Links From Within Math Blocks

OK, after some investigation I found a promising direction. By default, the protocols that we are allowed to use in \href are the following. file: http: https: (You can check it by MathJax.config.options.safeOptions.safeProtocols) So we can’t use obsidian: or javascript: to open a note in the vault. However, we can change this setting afterward. For example, running the following in the dev console (or as a Templater/QuickAdd startup script) will enable us to use Obsidian URI inside \href. …