[Feature] Subscription broadcast buffer size is fixed

[mattsse]

Component

providers, pubsub

Describe the feature you would like

The buffer size for subscriptions is currently a constant.

alloy/crates/pubsub/src/managers/active_sub.rs

Lines 56 to 60 in fcbf995

	impl ActiveSubscription {
	/// Create a new active subscription.
	pub(crate) fn new(request: SerializedRequest) -> (Self, broadcast::Receiver<Box<RawValue>>) {
	let local_id = request.params_hash();
	let (tx, rx) = broadcast::channel(16);

This should be configurable.

we should add settings for the

alloy/crates/pubsub/src/service.rs

Line 20 in fcbf995

pub(crate) struct PubSubService<T> {

so you can call connect(connector, settings)

wdyt @prestwich

Additional context

No response