[Json RPC] Catch Trie exception on eth_getStorage call

[brbrr]

When trying to get a missing storage via RPC call, we not handling the missing node well, so we end up returning exception trace into the RPC response. example call & response:

curl 172.234.253.190:8545 \
  -X POST \
  -H "Content-Type: application/json" \
  --data '{"jsonrpc": "2.0", "method": "eth_getStorageAt", "params": ["0x4d9079bb4165aeb4084c526a32695dcfd2f77381", "0x0000000000000000000000000000000000000000000000000000000000000002", "0xda7485"], "id": 662251708906005292}'

Response:

{"jsonrpc":"2.0","error":{"code":-32603,"message":"Internal error","data":"Nethermind.Trie.MissingTrieNodeException: Node 0x7624432bf4159f20277937ee01260167ef485023da8e2814c7e5b6dd2665346f is missing from the DB\n ---> Nethermind.Trie.TrieNodeException: Failed to load root hash 0x7624432bf4159f20277937ee01260167ef485023da8e2814c7e5b6dd2665346f while loading key d2313780e872947b0af5192f9f8a83047a495d8fba883ae44701b43000eb1a32.\nNode 0x7624432bf4159f20277937ee01260167ef485023da8e2814c7e5b6dd2665346f is missing from the DB\n   at Nethermind.Trie.Pruning.ReadOnlyTrieStore.ScopedReadOnlyTrieStore.Nethermind.Trie.Pruning.ITrieNodeResolver.LoadRlp(TreePath& path, Hash256 hash, ReadFlags flags)\n   at Nethermind.Trie.PatriciaTree.ResolveNode(TrieNode node, TraverseContext& traverseContext, TreePath& path) in /src/Nethermind/Nethermind.Trie/PatriciaTree.cs:line 571\n   --- End of inner exception stack trace ---\n   at Nethermind.Trie.PatriciaTree.ResolveNode(TrieNode node, TraverseContext& traverseContext, TreePath& path) in /src/Nethermind/Nethermind.Trie/PatriciaTree.cs:line 579\n   at Nethermind.Trie.PatriciaTree.Get(ReadOnlySpan`1 rawKey, Hash256 rootHash) in /src/Nethermind/Nethermind.Trie/PatriciaTree.cs:line 333\n   at Nethermind.State.StateReader.TryGetState(Hash256 stateRoot, Address address, AccountStruct& account) in /src/Nethermind/Nethermind.State/StateReader.cs:line 70\n   at Nethermind.State.StateReader.GetStorage(Hash256 stateRoot, Address address, UInt256& index) in /src/Nethermind/Nethermind.State/StateReader.cs:line 27\n   at Nethermind.State.StateReader.Nethermind.State.IStateReader.GetStorage(Hash256 stateRoot, Address address, UInt256& index)\n   at Nethermind.JsonRpc.Modules.Eth.EthRpcModule.eth_getStorageAt(Address address, UInt256 positionIndex, BlockParameter blockParameter) in /src/Nethermind/Nethermind.JsonRpc/Modules/Eth/EthRpcModule.cs:line 181\n   at InvokeStub_IEthRpcModule.eth_getStorageAt(Object, Object, Object, Object, Object)\n   at System.Reflection.MethodInvoker.InvokeImpl(Object obj, Object arg1, Object arg2, Object arg3, Object arg4)\n   at System.Reflection.MethodInvoker.Invoke(Object obj, Span`1 arguments)\n   at Nethermind.JsonRpc.JsonRpcService.ExecuteAsync(JsonRpcRequest request, String methodName, ResolvedMethodInfo method, JsonRpcContext context) in /src/Nethermind/Nethermind.JsonRpc/JsonRpcService.cs:line 175"},"id":662251708906005292}

I went for a most obvious solution, although not sure if it's the best one.

I've updated the response to match geth implementation (with wrong-ish error code):

{
    "jsonrpc": "2.0",
    "error": {
        "code": -32000,
        "message": "missing trie node 0x7624432bf4159f20277937ee01260167ef485023da8e2814c7e5b6dd2665346f (path ) state 0x7624432bf4159f20277937ee01260167ef485023da8e2814c7e5b6dd2665346f is not available"
    },
    "id": 662251708906005292
}

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