Feature/mel scale for spectrogram #915

Job	Run time
⬢ Prepare Node.js	24s
🔍 Check if pull request	2s
🐍 Prepare Python	34s
🧱 Build test matrix	9s
🔍 Check	3m 18s
🗃 Build datasets	2m 27s
📝 Build API docs	50s
🧱 Build Spotlight	3m 8s
🧪 Doc Test	1m 29s
🧪 Unit Test	1m 34s
🔍 Check wheel contents	34s
🧪 Integration Test (ubuntu-latest, 3.8)	11m 24s
🧪 UI Test (chrome)	3m 30s
🧪 UI Test (firefox)	4m 5s
🚀 Release Spotlight	0s
	33m 28s

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