[Feature] Add standalone HttpError response error type

[mattsse]

Component

rpc

Describe the feature you would like

alloy/crates/transport-http/src/hyper.rs

Lines 43 to 47 in 09e90e8

	return Err(TransportErrorKind::custom_str(&format!(
	r#"HTTP error: {} with body: "{}""#,
	status,
	String::from_utf8_lossy(body.as_ref())
	)));

this makes it very hard to check for HTTP errors for things like retry:

foundry-rs/foundry#7384

TODO

add a standalone Error struct so we can try downcasting this from the Custom variant, though perhaps this should even be its own variant

FYI: @zerosnacks

Additional context

No response

[prestwich]

extend TransportErrorKind too

[prestwich]

should this be done in a separate PR, as retry layer seems pretty big and a ways off from completion