database: added totp codes migrations, get/add/use token

crates/database/migrations/20230426153143_totp_login_requests.down.sql

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+drop table if exists totp_login_requests;

crates/database/migrations/20230426153143_totp_login_requests.up.sql

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+create table if not exists totp_login_requests
+(
+    -- info
+    token      TEXT not null primary key,
+    user       TEXT not null references users (id),
+
+    -- timings
+    created_at TEXT not null default CURRENT_TIMESTAMP,
+    expires_at TEXT not null,
+    used_at    TEXT
+);