fix: make prop serialization opt-in for devtools (closes #1952) #1286

Job	Run time
get-leptos-changed / Detect Source Change	6s
CI (integrations/utils) / Run ci (nightly)	12m 12s
CI (integrations/viz) / Run ci (nightly)	12m 25s
CI (integrations/axum) / Run ci (nightly)	12m 30s
CI (integrations/actix) / Run ci (nightly)	12m 42s
CI (leptos) / Run ci (nightly)	47m 27s
CI (leptos_config) / Run ci (nightly)	11m 55s
CI (leptos_dom) / Run ci (nightly)	19m 16s
CI (leptos_hot_reload) / Run ci (nightly)	11m 6s
CI (leptos_macro) / Run ci (nightly)	18m 7s
CI (leptos_reactive) / Run ci (nightly)	27m 42s
CI (leptos_server) / Run ci (nightly)	19m 6s
CI (meta) / Run ci (nightly)	13m 2s
CI (router) / Run ci (nightly)	13m 15s
CI (server_fn) / Run ci (nightly)	12m 11s
CI (server_fn_macro) / Run ci (nightly)	11m 54s
CI (server_fn/server_fn_macro_default) / Run ci (nightly)	11m 50s
	4h 26m 46s

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