Use hashlink over lru for LruCache (#8911)

Use the `LruCache` implementation provided by `hashlink` instead of the current `lru` one.
This is mostly a 1-to-1 swap with only slight API incompatibilities.
I have decided to leave some config files which previously used `NonZeroUsize` but they may not be required anymore and could potentially switch to `usize`.


Co-Authored-By: Mac L <mjladson@pm.me>

beacon_node/http_api/Cargo.toml

@@ -20,12 +20,12 @@ ethereum_ssz = { workspace = true }
 execution_layer = { workspace = true }
 fixed_bytes = { workspace = true }
 futures = { workspace = true }
+hashlink = { workspace = true }
 health_metrics = { workspace = true }
 hex = { workspace = true }
 lighthouse_network = { workspace = true }
 lighthouse_version = { workspace = true }
 logging = { workspace = true }
-lru = { workspace = true }
 metrics = { workspace = true }
 network = { workspace = true }
 network_utils = { workspace = true }