Support terminal hyperlinks

[CosmicHorrorDev]

Lots of terminal emulators have started supporting hyperlinks (link with some deets)

The short of it is summed up by

A hyperlink is opened upon encountering an OSC 8 escape sequence with the target URI. The syntax is

OSC 8 ; params ; URI ST

Following this, all subsequent cells that are painted are hyperlinks to this target. A hyperlink is closed with the same escape sequence, omitting the parameters and the URI but keeping the separators:

OSC 8 ; ; ST

where:

• OSC (Operating System Command) is usually ESC ]
• params are optional special parameters for future use that are typically empty
• URI is a URI-encoded hyperlink
• ST (String Terminator) is typically ESC \ or sometimes the BEL character

Here's an example link that's included in rustc's output

ESC ] 8 ; ; https://doc.rust-lang.org/cargo/reference/profiles.html#default-profiles ESC \ 'dev' profile [unoptimized + debuginfo] ESC ] 8 ; ; ESC \

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Implementation-wise I was thinking we could allow customizing the hyperlink HTML output with a user-definable closure that gets the hyperlink's link, escaped text, and a mutable reference to the output HTML with a reasonable default implementation that creates the typical <a href> links