add schema starting edge to schemaadapter #1112

Job	Run time
Run JS linters	1m 41s
Check rustdoc WASM target	14s
Check lint and rustfmt	1m 3s
Check fuzz targets	28s
Run tests	2m 33s
WASM tests	55s
Python tests and maturin build (3.9)	1m 16s
Python tests and maturin build (3.10)	1m 28s
Python tests and maturin build (3.11)	1m 35s
pre-publish checks	0s
All CI stages	1s
pre-publish checks	0s
publish trustfall_filetests_macros	0s
publish trustfall_core	0s
publish python trustfall	0s
publish trustfall_derive	0s
publish trustfall	0s
publish trustfall_stubgen	0s
	11m 14s

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