[identity] modify get_all_user_details to return wallet addresses too

Summary:
this bug was kind of hidden because we were re-writing claimed wallet addresses to the reserved usernames table, so the identity search index was still being populated with all the addresses -- just from the wrong source. after D12831, we're no longer re-writing claimed wallet addresses to the reserved usernames table, so the identity search index will not contain claimed/registered wallet addresses. by modifying get_all_user_details to return wallet addresses, we resolve this issue.

Depends on D12831

Test Plan: called get_all_user_details from main and confirmed that it now contains UserDetails with wallet addresses

Reviewers: will, bartek

Reviewed By: bartek

Subscribers: ashoat, tomek

Differential Revision: https://phab.comm.dev/D12832