[improve] improve datasource class load #442

Job	Run time
License header	34s
Dead links	16s
Code style	23s
Sanity check results	1s
Dependency licenses	2m 36s
Unit Test (8, ubuntu-latest)	3m 42s
Build (8, ubuntu-latest)	4m 48s
Unit Test (8, windows-latest)	3m 58s
Integration Test (8, ubuntu-latest)	2m 3s
Build (8, windows-latest)	6m 51s
Unit Test (11, ubuntu-latest)	2m 18s
Integration Test (11, ubuntu-latest)	2m 54s
Build (11, ubuntu-latest)	4m 1s
Unit Test (11, windows-latest)	3m 52s
Build (11, windows-latest)	5m 6s
	43m 23s

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