Split ModelV2 implementation in multiple submodules #4793

Job	Run time
check_generated_railjson_sync	25s
build	12m 43s
check_commits	8s
check_infra_schema_sync	21s
check_integration_tests	1m 32s
check_osrd_schema	51s
check_railjson_generator	2m 23s
check_toml	8s
Check final newline	8s
check_editoast_lints	4m 35s
check_core	3m 43s
check_front_rtk_sync	1m 47s
check_editoast_tests	4m 48s
check_editoast_openapi	1m 21s
check_front	2m 5s
check_gateway	1m 27s
integration_tests	4m 39s
	43m 4s

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