chore: use ic-bn-lib in PocketIC HTTP gateway (#3028)

This PR uses the proxy functionality from `ic-bn-lib` to proxy `/api/v2`
and `/api/v3` requests in the PocketIC HTTP gateway instead of
reimplementing the proxy functionality in the PocketIC HTTP gateway.

Author: mraszyk

Cargo.lock

@@ -61,11 +61,13 @@ LIB_DEPENDENCIES = [
     "@crate_index//:hyper",
     "@crate_index//:hyper-util",
     "@crate_index//:ic-agent",
+    "@crate_index//:ic-bn-lib",
     "@crate_index//:ic-cdk",
     "@crate_index//:ic-http-gateway",
     "@crate_index//:ic-utils",
     "@crate_index//:itertools",
     "@crate_index//:rand",
+    "@crate_index//:reqwest",
     "@crate_index//:serde",
     "@crate_index//:serde_cbor",
     "@crate_index//:serde_json",

rs/pocket_ic_server/BUILD.bazel

@@ -27,6 +27,7 @@ http-body-util = { workspace = true }
 hyper = { workspace = true }
 hyper-util = { workspace = true }
 ic-agent = { workspace = true }
+ic-bn-lib = { workspace = true }
 ic-boundary = { path = "../boundary_node/ic_boundary" }
 ic-btc-adapter = { path = "../bitcoin/adapter" }
 ic-canister-sandbox-backend-lib = { path = "../canister_sandbox" }
@@ -65,6 +66,7 @@ ic-validator-ingress-message = { path = "../validator/ingress_message" }
 itertools = { workspace = true }
 pocket-ic = { path = "../../packages/pocket-ic" }
 rand = { workspace = true }
+reqwest = { workspace = true }
 serde = { workspace = true }
 serde_cbor = { workspace = true }
 serde_json = { workspace = true }