add links from CLI output to capa rules website

[williballenthin]

we can use a modern terminal feature to make some text a link to a URL, such as described here: https://www.willmcgugan.com/blog/tech/post/real-working-hyperlinks-in-the-terminal-with-rich/

So, for example, each rule name in the default output could be a link to the rules website, showing the rule content.

I think that for terminals that don't support this feature, the link degrades to text, just like is shown today.

The rich library that we use for rendering already has a link feature that we can use here.

[williballenthin]

other places:

• if/when we show global prevalence information, those terms could link to VT searches
• ATT&CK and MBC links
• reference links
• sample SHA256 on VT

[williballenthin]

[williballenthin]

but when combining with color characters, tabulate (i think) gets confused about the cell width:

we may need to migrate to rich to build the tables or hack around a bit.

[williballenthin]

[s-ff]

Does this feature work with all terminal emulators? I imagine only modern consoles supporting this
EDIT: If unsupported consoles display normally (i.e. the output remains unaffected), this would be a great addition

[williballenthin]

Yeah, when unsupported, then the text falls back to how it's shown today. And I don't think there's logic that does this - the terminal emulator just ignores the control codes it doesn't understand.

[williballenthin]

It doesn't work under tmux but does under zellij and xterm. i can test Windows Thermal Terminal later today.