Add database layering tests to flashblocks-rpc

Add tests verifying the correct State<CacheDB<StateProviderDatabase>>
layering order. These tests demonstrate that CacheDB<State<...>> loses
writes because CacheDB intercepts all writes into its internal cache
without propagating them to State's bundle tracking.

Author: niran

Cargo.lock

@@ -79,6 +79,7 @@ arc-swap.workspace = true
 [dev-dependencies]
 base-reth-test-utils.workspace = true
 rand.workspace = true
+revm.workspace = true
 reth-db.workspace = true
 reth-testing-utils.workspace = true
 reth-db-common.workspace = true