feat: websockets (#1)

This PR:

1. Replaces the polling of JSON-RPC to a websockets subscription to the
local node.
2. Prior to updating the shared state, a sanity check is done in order
to ensure the latest block received by websockets can actually be polled
by JSON-RPC, ensuring the same path used by services is checked.

Cargo.toml

@@ -13,6 +13,7 @@ alloy = { git = "https://github.com/alloy-rs/alloy", rev = "bfd0fda", features =
     "network",
     "providers",
     "provider-http",
+    "provider-ws",
     "rpc-client",
     "rpc-types-eth",
 ] }
@@ -30,6 +31,7 @@ tokio = { version = "1", features = ["rt-multi-thread", "macros", "sync"] }
 tracing = { version = "0.1.40", features = ["attributes"] }
 tracing-opentelemetry = "0.23.0"
 tracing-subscriber = { version = "0.3.18", features = ["env-filter"] }
+url = "2.5.0"
 warp = "0.3.7"
 
 [profile.maxperf]