Tests

Add more type annotations (#1261) #680

Job	Run time
(ubuntu-latest, Py3.7, sk0.21.2, sk-only:true)	15m 40s
(ubuntu-latest, Py3.7, sk0.22.2, sk-only:true)	14m 4s
(ubuntu-latest, Py3.7, sk0.23.1, sk-only:true)	14m 24s
(ubuntu-latest, Py3.7, sk0.24, sk-only:true)	16m 42s
(ubuntu-latest, Py3.8, sk0.22.2, sk-only:true)	33m 14s
(ubuntu-latest, Py3.8, sk0.23.1, sk-only:true)	32m 58s
(ubuntu-latest, Py3.8, sk0.24, sk-only:true)	28m 0s
(ubuntu-20.04, Py3.6, sk0.18.2, sk-only:true)	47s
(ubuntu-20.04, Py3.6, sk0.19.2, sk-only:true)	46s
(ubuntu-20.04, Py3.6, sk0.20.2, sk-only:true)	44s
(ubuntu-20.04, Py3.6, sk0.21.2, sk-only:true)	47s
(ubuntu-20.04, Py3.6, sk0.22.2, sk-only:true)	46s
(ubuntu-20.04, Py3.6, sk0.23.1, sk-only:true)	48s
(ubuntu-20.04, Py3.6, sk0.24, sk-only:true)	43s
(ubuntu-latest, Py3.8, sk0.23.1, sk-only:false)	1h 11m 41s
(windows-latest, Py, sk0.24.*, sk-only:false)	51m 12s
	4h 43m 16s

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