feat: `Action::new` and `Action::server` (#1998) #1200

Job	Run time
get-leptos-changed / Detect Source Change	6s
CI (integrations/viz) / Run ci (nightly)	12m 34s
CI (integrations/axum) / Run ci (nightly)	16m 46s
CI (integrations/actix) / Run ci (nightly)	12m 31s
CI (integrations/utils) / Run ci (nightly)	11m 45s
CI (leptos) / Run ci (nightly)	45m 59s
CI (leptos_config) / Run ci (nightly)	11m 30s
CI (leptos_dom) / Run ci (nightly)	26m 28s
CI (leptos_hot_reload) / Run ci (nightly)	12m 0s
CI (leptos_macro) / Run ci (nightly)	17m 35s
CI (leptos_reactive) / Run ci (nightly)	27m 24s
CI (leptos_server) / Run ci (nightly)	18m 45s
CI (meta) / Run ci (nightly)	12m 37s
CI (router) / Run ci (nightly)	13m 41s
CI (server_fn) / Run ci (nightly)	15m 59s
CI (server_fn_macro) / Run ci (nightly)	11m 10s
CI (server_fn/server_fn_macro_default) / Run ci (nightly)	11m 14s
	4h 38m 4s

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