Create GenerateShareURL functions in status-go

[jrainville]

Description

The Web team came up with a new format for the share links.
We need to create a new status-go function/API to generate those.
We also need the function/API to "decrypt" them when we see them in a message.

The reason for it to be in status-go is so mobile can take advantage of them as well.

You can find the spec here: vacp2p/rfc#600

Discussion here: status-im/status-web#327

Acceptance Criteria

• The status-go backend has one or multiple functions that can generate a "share url" for:
  • community /c/ (to open the community)
  • community channel /cc/ (to open a community channel in the community)
  • user /u/ (to open the 1-1 chat)
• The status-go backend has a function to "decrypt" those URLs. 2 options:
  • Basic API that we pass the URL to and it gives us the link data as JSON
  • Better but more complex approach: detect those links in the messages when we handle the message and add the link data to the message object itself.
• There is one or more tests in status-go for that API

Does not include any UI work or linking yet.

[MishkaRogachev]

A few tails:
#11403
status-im/status-go#3713