Convert numpy datetimes to us #936

Job	Run time
⬢ Prepare Node.js	19s
🔍 Check if pull request	2s
🐍 Prepare Python	31s
🧱 Build test matrix	7s
📝 Build API docs	48s
🗃 Build datasets	2m 30s
🔍 Check	2m 19s
🧱 Build Spotlight	3m 27s
🧪 Doc Test	1m 26s
🧪 Unit Test	1m 41s
🔍 Check wheel contents	41s
🧪 UI Test (chrome)	3m 21s
🧪 Integration Test (ubuntu-latest, 3.8)	12m 27s
🧪 UI Test (firefox)	3m 39s
🚀 Release Spotlight	0s
	33m 18s

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