feat(chain): Add `initial_changeset` to graphs #265

Job	Run time
Check no_std	26s
Build and test (stable, true, --no-default-features)	2m 11s
Build and test (stable, true, --all-features)	4m 8s
Build and test (1.57.0, --no-default-features)	3m 7s
Build and test (1.57.0, --all-features)	4m 29s
Check WASM	1m 7s
clippy_check	37s
Rust fmt	9s
	16m 14s

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