Add "Go to Source" link in api-docs (per method)

[ST-DDT]

Clear and concise description of the problem

Some users might wish to read the sources of a method instead of the documentation.

Suggested solution

Add a link to navigate to the source code of a method.

Alternative

No response

Additional context

Accessible via signature.sources[0?].{filename, line, url}

[Shinigami92]

Cool 👍

VueUse also has something like this: https://vueuse.org/shared/createGlobalState/#source

[ST-DDT]

PR created: #1780