[Feature] Improve Chainpoller stream impl

[mattsse]

Component

rpc

Describe the feature you would like

ref #1052

this stream loop is a bit weird, because this listens for new heads and then fetches the missing range in full, using a cache to store to tmp store the full block:

alloy/crates/provider/src/chain.rs

Lines 49 to 52 in c461d68

	pub(crate) fn into_stream(mut self) -> impl Stream<Item = Block> + 'static {
	stream! {
	let mut poll_task = self.poll_task.spawn().into_stream_raw();
	'task: loop {

fetching the blocks can also be done sequentially and we should yield the next block immediately, like a FuturesOrdered or similar

cc @popzxc

Additional context

No response