allow construction by making `data` public #1048

Job	Run time
get-leptos-changed / Detect Source Change	5s
CI (integrations/utils) / Run ci (nightly)	16m 15s
CI (integrations/actix) / Run ci (nightly)	22m 55s
CI (integrations/axum) / Run ci (nightly)	16m 14s
CI (integrations/viz) / Run ci (nightly)	19m 59s
CI (leptos) / Run ci (nightly)	1h 48m 10s
CI (leptos_config) / Run ci (nightly)	15m 12s
CI (leptos_dom) / Run ci (nightly)	34m 27s
CI (leptos_hot_reload) / Run ci (nightly)	15m 46s
CI (leptos_macro) / Run ci (nightly)	26m 57s
CI (leptos_server) / Run ci (nightly)	25m 35s
CI (leptos_reactive) / Run ci (nightly)	38m 35s
CI (meta) / Run ci (nightly)	16m 11s
CI (router) / Run ci (nightly)	18m 16s
CI (server_fn) / Run ci (nightly)	21m 4s
CI (server_fn_macro) / Run ci (nightly)	18m 11s
CI (server_fn/server_fn_macro_default) / Run ci (nightly)	14m 26s
	7h 8m 18s

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