PRO-3122 & PRO-3084: Deprecate did for agentId & use POST /positions

[ghost]

Summary of Changes

• Update all uses of did to instead be agentId
  • Db Migration updates db columns in sms_otp, wallet_credentials, and external_id
  • Update code throughout repo wherever function definitions use did to instead use agentId
  • Update tests
  • Update calls to Bio Auth Service to use agentId instead of id or did
• Call to Bio Auth Service to get positions now uses POST /positions instead of the deprecated GET
• Call to Bio Auth Service to verify now sends position and image in a params object instead of deprecated top level field
• Call to Bio Auth Service to verify no longer sends a backend

Depends on Bio Auth Service PR: kiva/guardian-bio-auth#31

[jsaur]

👍