gnd: Support multiple subgraphs, grafting, subgraph composition in dev mode #9765

Job	Run time
Build in release mode	4m 25s
Clippy linting	1m 9s
Run integration tests	5m 26s
Subgraph Runner integration tests	7m 38s
Check rustfmt style	8s
Run unit tests	11m 12s
	29m 58s

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