feat(integrations): allow callbacks as integration config #1597

Job	Run time
Tests without optional packages (7.4, highest)	50s
Tests without optional packages (7.2, lowest, 4.4.*)	38s
Tests without optional packages (8.4, highest)	51s
Tests without optional packages (8.0, lowest, 4.4.*)	43s
Tests (7.2, 4.4.*, highest)	42s
Tests (7.3, 5.*, highest)	51s
Tests (7.3, 4.4.*, highest)	54s
Tests (8.0, 6.*, highest)	50s
Tests (8.0, 5.*, highest)	43s
Tests (8.0, 4.4.*, highest)	44s
Tests (7.2, 5.*, highest)	48s
Tests (8.1, 6.*, highest)	45s
Tests (8.1, 4.4.*, highest)	52s
Tests (8.1, 5.*, highest)	43s
Tests (8.2, 5.*, highest)	48s
Tests (8.2, 6.*, highest)	42s
Tests (8.2, 4.4.*, highest)	49s
Tests (8.3, 4.4.*, highest)	49s
Tests (8.4, 5.*, highest)	38s
Tests (8.3, 6.*, highest)	45s
Tests (7.4, 5.*, highest)	49s
Tests (8.3, 5.*, highest)	42s
Tests (7.2, 4.4.*, lowest)	46s
Tests (7.4, 4.4.*, highest)	49s
Tests (8.0, 6.*, lowest)	33s
Tests (7.2, 5.*, lowest)	39s
Tests (8.4, 7.*, highest)	48s
Tests (8.3, 7.*, highest)	44s
Tests (8.2, 7.*, lowest)	44s
Tests (8.4, 6.*, highest)	47s
Tests (8.2, 7.*, highest)	50s
	23m 36s

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