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/lighthouse_network/Cargo.toml

@@ -21,6 +21,7 @@ ethereum_ssz_derive = { workspace = true }
 fixed_bytes = { workspace = true }
 fnv = { workspace = true }
 futures = { workspace = true }
+hashlink = { workspace = true }
 hex = { workspace = true }
 if-addrs = "0.14"
 itertools = { workspace = true }
@@ -28,7 +29,6 @@ libp2p = { workspace = true }
 libp2p-mplex = { git = "https://github.com/libp2p/rust-libp2p.git" }
 lighthouse_version = { workspace = true }
 logging = { workspace = true }
-lru = { workspace = true }
 lru_cache = { workspace = true }
 metrics = { workspace = true }
 network_utils = { workspace = true }