gnd: Support multiple subgraphs, grafting, subgraph composition in dev mode #9769

Job	Run time
Clippy linting	2m 28s
Build in release mode	3m 11s
Run integration tests	6m 56s
Subgraph Runner integration tests	5m 9s
Check rustfmt style	7s
Run unit tests	9m 43s
	27m 34s

Provide feedback