gnd: Support multiple subgraphs, grafting, subgraph composition in dev mode #9929

Job	Run time
Subgraph Runner integration tests	7m 20s
Run integration tests	9m 45s
Check rustfmt style	7s
Run unit tests	9m 8s
Build in release mode	4m 4s
Clippy linting	3m 57s
	34m 21s

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