[#400] Resolve "signalc: handle safety number changes"

Closes #400 (closed)

signalc:

• Handle outbound identity failure
  • Save new identity key returned from signal server
• Handle trust socket request from signalboost
• Handle inbound identity failure
• Add indices for Identities table
• Add protocol store fns to trustFingerprintForAllIdentities and saveFingerprintForAllIdentities
• Add test to validate active SessionRecord being archived correctly

signalboost:

• Handle sending to subscriber with new safety number
• Handle receiving from subscriber with new safety number
• Change deauthorization column fingerprint to text to handle full fingerprint text with (byte)0x.. format
• Update safetyNumberChanged notification text
• Update deauthorization notification text

tooling:

• Add bin/db/setup-sc for creating signalc databases