Allow consuming iterator when decoding compact proof.

[cheme]

In cumulus, decoding involve *2 size of proof memory usage from pvf during decoding.

This PR switch trie_codec to allow consuming iterator : see decode_compact_from_iter_owned that will allow
us to do iteraton on storage proof in a consuming way with cumulus.

Something like

let mut nodes = storage_proof.encoded_nodes;
nodes.reverse();
let root = match sp_trie::decode_compact_owned::<sp_trie::Layout<HashFor<B>>, _, _>(
		&mut db,
		sp_std::iter::from_fn(move|| nodes.pop()),
		Some(parent_head.state_root()),
	) {

Note that there will always be a time when we got twice the memory of a single node, but that is the same for any storage read.

cc\ @bkchr

[bkchr]

I realized this will probably not bring that much, but yeah looks good.