[feature] add mongodb datasource #422

Job	Run time
Code style	27s
Dead links	14s
License header	57s
Sanity check results	2s
Integration Test (8, ubuntu-latest)	4m 6s
Dependency licenses	3m 55s
Build (8, ubuntu-latest)	5m 7s
Integration Test (11, ubuntu-latest)	5m 17s
Unit Test (8, ubuntu-latest)	3m 22s
Build (8, windows-latest)	11m 27s
Unit Test (8, windows-latest)	11m 23s
Build (11, ubuntu-latest)	6m 26s
Unit Test (11, ubuntu-latest)	3m 14s
Build (11, windows-latest)	7m 58s
Unit Test (11, windows-latest)	8m 12s
	1h 12m 7s

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