Add deprecation warning to descriptors module #856

Job	Run time
🐍 Prepare Python	31s
🔍 Check if pull request	4s
⬢ Prepare Node.js	21s
🧱 Build test matrix	7s
📝 Build API docs	57s
🧱 Build Spotlight	3m 51s
🗃 Build datasets	2m 49s
🔍 Check	3m 0s
🧪 Doc Test	1m 12s
🧪 Unit Test	1m 24s
🧪 UI Test (chrome)	4m 31s
🔍 Check wheel contents	30s
🧪 UI Test (firefox)	3m 30s
🧪 Integration Test (ubuntu-latest, 3.8)	11m 40s
🚀 Release Spotlight	0s
	34m 27s

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