feat: allow disposing of Signal & StoredValue (#1849) #952

Job	Run time
get-leptos-changed / Detect Source Change	5s
CI (integrations/actix) / Run ci (nightly)	18m 27s
CI (integrations/axum) / Run ci (nightly)	16m 28s
CI (integrations/utils) / Run ci (nightly)	15m 20s
CI (integrations/viz) / Run ci (nightly)	23m 2s
CI (leptos) / Run ci (nightly)	1h 21m 48s
CI (leptos_config) / Run ci (nightly)	21m 22s
CI (leptos_dom) / Run ci (nightly)	28m 30s
CI (leptos_hot_reload) / Run ci (nightly)	17m 29s
CI (leptos_macro) / Run ci (nightly)	25m 28s
CI (leptos_reactive) / Run ci (nightly)	39m 45s
CI (leptos_server) / Run ci (nightly)	27m 11s
CI (meta) / Run ci (nightly)	19m 15s
CI (router) / Run ci (nightly)	19m 17s
CI (server_fn) / Run ci (nightly)	16m 14s
CI (server_fn_macro) / Run ci (nightly)	19m 20s
CI (server_fn/server_fn_macro_default) / Run ci (nightly)	15m 45s
	6h 44m 46s

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