Tests

feat: implement flat_answer_map #2854

Job	Run time
Lint	42s
Package tests	12m 53s
Docker tests	18m 48s
Compatibility tests / Postgres 10, Python 3.8	16m 0s
Compatibility tests / Postgres 11, Python 3.8	14m 33s
Compatibility tests / Postgres 10, Python 3.9	12m 14s
Compatibility tests / Postgres 11, Python 3.9	12m 7s
Compatibility tests / Postgres 10, Python 3.10	14m 41s
Compatibility tests / Postgres 13, Python 3.8	17m 35s
Compatibility tests / Postgres 11, Python 3.10	16m 12s
Compatibility tests / Postgres 13, Python 3.9	11m 6s
Compatibility tests / Postgres 13, Python 3.10	13m 15s
Compatibility tests / Postgres 12, Python 3.8	12m 17s
Compatibility tests / Postgres 12, Python 3.9	14m 18s
Compatibility tests / Postgres 12, Python 3.10	16m 36s
Compatibility tests / Postgres 14, Python 3.8	14m 53s
Compatibility tests / Postgres 14, Python 3.9	16m 10s
Compatibility tests / Postgres 15, Python 3.8	11m 26s
Compatibility tests / Postgres 14, Python 3.10	14m 25s
Compatibility tests / Postgres 15, Python 3.9	11m 15s
Compatibility tests / Postgres 15, Python 3.10	12m 3s
	4h 43m 29s

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