[presidential map] recreate sql logic used for classic

[jason-upchurch]

Summary

Need to recreate / use the SQL logic @fec-jli implemented when creating the presidential maps for the classic site.

Completion criteria

• SQL logic created

[lbeaufort]

From @fec-jli : #4170 (comment)

[patphongs]

Closing since this is rolled into endpoint work

[lbeaufort]

Endpoint tickets:
#4170 Endpoint 1) Make endpoint for candidate list (presidential/contributions/by_candidate)
#4178 Endpoint 2) and 5) Make endpoint for coverage dates and summaries (financial_summary, coverage_date)
#4177 Endpoint 3) and 4) Make endpoints for aggregates (by_state, by_size)