feat: add support for custom encoding to `#[server]` macro #1529

Job	Run time
get-leptos-changed / Detect Source Change	4s
CI (integrations/actix) / Run ci (nightly)	12m 36s
CI (integrations/utils) / Run ci (nightly)	11m 41s
CI (integrations/axum) / Run ci (nightly)	12m 19s
CI (leptos_dom) / Run ci (nightly)	17m 46s
CI (leptos_hot_reload) / Run ci (nightly)	11m 29s
CI (leptos) / Run ci (nightly)	1h 17m 54s
CI (leptos_config) / Run ci (nightly)	10m 38s
CI (leptos_macro) / Run ci (nightly)	23m 49s
CI (leptos_reactive) / Run ci (nightly)	37m 34s
CI (leptos_server) / Run ci (nightly)	16m 49s
CI (meta) / Run ci (nightly)	11m 49s
CI (router) / Run ci (nightly)	12m 40s
CI (server_fn) / Run ci (nightly)	29m 10s
CI (server_fn_macro) / Run ci (nightly)	11m 16s
CI (server_fn/server_fn_macro_default) / Run ci (nightly)	12m 23s
	5h 9m 57s

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