Simplify and refactor state management

[olabini]

This issue is about track everything related to the client orchestration, making sure state is read and available at the right times, and that publication happens when it should.

[olabini]

There are several issues that are closely connected to this one:

• 140

• 139

• otrv4/pidgin-otrng#87
• otrv4/pidgin-otrng#85
• otrv4/pidgin-otrng#82
• otrv4/pidgin-otrng#72
• otrv4/pidgin-otrng#13
• otrv4/pidgin-otrng#9
• otrv4/pidgin-otrng#8

[olabini]

This involves these objects:

• [x] Private long term key
• [x] Forging key
• [x] Client profile
• [x] Expired client profile (only loading etc)
• [x] Prekey profile
• [x] Expired prekey profile (only loading etc)
• [x] Prekey messages
• [x] Private material corresponding to prekey profile
• [x] Private material corresponding to prekey messages
• Fingerprints (for now, let's keep them outside of orchestration - the life cycle is different)
• Instance tags (for now, let's keep them outside of orchestration - the life cycle is different)

[olabini]

With the latest commits the private prekey profile material is now managed together with the prekey profile, so no need to manage it separately.

[olabini]

I would say this is done. At some point I'll tackle the v3 keys, instance tags and fingerprints, but I think I'll do that outside of this issue.

[claucece]

Thanks @olabini