feat: copy current IPFS path for IPNS address

[lidel]

This PR implements context menu item to get current CID for an IPNS address:

Closes #508

I am quite sure this needs to be reworded before merging.

@olizilla Any ideas how to label this feature?

[olizilla]

This might be more intuitive if we change it to show the user the information rather than trying to frame it as a set of questions... like:

IPFS Resource loaded via Custom Gateway

^URL
http://ipfs.io/ipns/room.guardian

^PATH
/ipns/room.guardian

^CID
bafybafybafybase32yeahwoo

---

• Copy URL
• Pin CID to local repo

[lidel]

@olizilla something like this?

I like this direction. Clicking on URL, PATH, CID would select entire thing and copy it to clipboard, so most of menu items could be removed.

Not sure how to represent "IPFS resource loaded via Custom Gateway" – it looks out of place.
Perhaps if we show full URL like this, there is no need for it at all?

[olizilla]

I think URL in that menu should always show the canonical http url https://ipfs.io/ip*

We could use it to show other address forms too as they become supported... hello ipfs://*

[lidel]

Let's continue brainstorming on this in #587