gnd: Support multiple subgraphs, grafting, subgraph composition in dev mode #9822

Job	Run time
Build in release mode	2m 37s
Subgraph Runner integration tests	6m 3s
Run integration tests	5m 20s
Clippy linting	1m 14s
Check rustfmt style	11s
Run unit tests	11m 18s
	26m 43s

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