Build

Add serde for Keyword extraction pipeline #597

Job	Run time
Build Linux	1m 43s
Build Windows	4m 47s
Build macOS	1m 17s
Build no defaults	1m 39s
Clippy	1m 9s
Model conversion test	3m 0s
Rustfmt	8s
Integration tests (batch 0)	4m 27s
Integration tests (batch 1)	5m 25s
Integration tests (batch 2)	4m 21s
Integration tests (Optional features)	14m 27s
	42m 23s

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