editoast: add editoast_schemas empty lib #3905

Job	Run time
check_railjson_generator	1m 40s
check_commits	6s
check_generated_railjson_sync	21s
build	13m 9s
check_infra_schema_sync	16s
check_integration_tests	1m 35s
check_osrd_schema	45s
Check final newline	8s
check_front_rtk_sync	1m 20s
check_editoast_lints	4m 27s
check_core	4m 8s
check_editoast_tests	4m 6s
check_gateway	1m 33s
check_editoast_openapi	1m 11s
check_front	1m 44s
integration_tests	4m 44s
	41m 13s

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