api: get file extension from key #1397

Job	Run time
Tests (3.7, pypi, redis, postgresql11, opensearch1)	3m 1s
Tests (3.7, pypi, redis, postgresql11, elasticsearch7)	4m 33s
Tests (3.7, pypi, redis, mysql5, opensearch1)	4m 1s
Tests (3.7, pypi, redis, mysql5, elasticsearch7)	3m 49s
Tests (3.8, pypi, redis, postgresql11, opensearch1)	4m 15s
Tests (3.8, pypi, redis, postgresql11, elasticsearch7)	3m 17s
Tests (3.8, pypi, redis, postgresql13, opensearch1)	3m 24s
Tests (3.8, pypi, redis, postgresql13, elasticsearch7)	4m 23s
Tests (3.8, pypi, redis, mysql5, opensearch1)	6m 1s
Tests (3.8, pypi, redis, mysql5, elasticsearch7)	3m 44s
Tests (3.8, pypi, redis, mysql8, opensearch1)	3m 54s
Tests (3.8, pypi, redis, mysql8, elasticsearch7)	3m 48s
Tests (3.9, pypi, redis, postgresql11, opensearch1)	3m 19s
Tests (3.9, pypi, redis, postgresql11, elasticsearch7)	3m 20s
Tests (3.9, pypi, redis, postgresql13, opensearch1)	3m 21s
Tests (3.9, pypi, redis, postgresql13, elasticsearch7)	3m 8s
Tests (3.9, pypi, redis, mysql5, opensearch1)	3m 37s
Tests (3.9, pypi, redis, mysql5, elasticsearch7)	3m 41s
Tests (3.9, pypi, redis, mysql8, opensearch1)	5m 28s
Tests (3.9, pypi, redis, mysql8, elasticsearch7)	4m 40s
	1h 18m 44s

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