[AUD-1114] Add slot diff in discovery responses

[raymondjacobson]

Description

Add plays slot info to all API responses so they can be monitored on every request and allow clients to reselect.

Tests

Local stack, verify API responses

How will this change be monitored?

Should be a no-op until clients decide to consume values

[hareeshnagaraj]

This looks fine, but how would we handle legacy plays?

audius-protocol/discovery-provider/src/queries/get_health.py

Line 420 in 900044e

"time_diff_general": time_diff_general

this does have a fallback to time_diff_general which includes the legacy difference. might not be a real issue though since sol has been generally up

[raymondjacobson]

This looks fine, but how would we handle legacy plays?

audius-protocol/discovery-provider/src/queries/get_health.py

Line 420 in 900044e

"time_diff_general": time_diff_general

this does have a fallback to time_diff_general which includes the legacy difference. might not be a real issue though since sol has been generally up

we went for a long time w/o this sort of health check on the legacy fallback. i think it's ok for the purposes of this b/c we aren't seeing a huge discrepancy in that system between nodes. this would be to near-term prevent us from picking a behind sol indexing discovery node