Fix Warning Expected subscription, but received an id response instead

[haerdib]

See comment: #620 (comment):

Example hangs if an error should be returned.

Steps to reproduce:
run integritee-node 1.0.36 (polkadot-0.9.42 deps)

wget https://github.com/integritee-network/integritee-node/releases/download/1.0.36/integritee-node-dev
chmod +x integritee-node-dev
./integritee-node-dev --dev 

run substrate api client example:

git checkout polkadot-v0.9.42
export RUST_LOG=warn
cargo run -p ac-examples --example transfer_with_ws_client

Just logs the warning and keeps on waiting for a response.

[2023-07-24T13:25:21Z DEBUG substrate_api_client::rpc::tungstenite_client::client] got on_subscription_msg {"jsonrpc":"2.0","error":{"code":1002,"message":"Verification Error: Runtime error: Execution failed: Runtime panicked: Bad input data provided to validate_transaction: Could not decode `RuntimeCall::System.0`:\n\tCould not decode `Call`, variant doesn't exist\n","data":"RuntimeApi(\"Execution failed: Runtime panicked: Bad input data provided to validate_transaction: Could not decode `RuntimeCall::System.0`:\\n\\tCould not decode `Call`, variant doesn't exist\\n\")"},"id":"1"}
[2023-07-24T13:25:21Z WARN  substrate_api_client::rpc::tungstenite_client::client] Expected subscription, but received an id response instead: Object {"error": Object {"code": Number(1002), "data": String("RuntimeApi(\"Execution failed: Runtime panicked: Bad input data provided to validate_transaction: Could not decode `RuntimeCall::System.0`:\\n\\tCould not decode `Call`, variant doesn't exist\\n\")"), "message": String("Verification Error: Runtime error: Execution failed: Runtime panicked: Bad input data provided to validate_transaction: Could not decode `RuntimeCall::System.0`:\n\tCould not decode `Call`, variant doesn't exist\n")}, "id": String("1"), "jsonrpc": String("2.0")}

To be looked into: Is this a problem of ws-client/ tungstenite client only, but also jsonrpsee?

[haerdib]

Update: Jsonrpsee does not hang:
Tested with cargo run -p ac-examples --example event_error_details:

[+] Composed extrinsic: UncheckedExtrinsic(Some((MultiAddress::Id(d43593c715fdd31c61141abd04a99fd6822c8558854ccde39a5684e7a56da27d (5GrwvaEF...)), GenericSignedExtra { era: Era::Immortal, nonce: 0, tip: AssetTip { tip: 0, asset: None } })), ([10, 0], MultiAddress::Id(8eaf04151687736326c9fea17e25fc5287613693c912909cb226aa4794f26a48 (5FHneW46...)), 1000000000000000))
[+] Transaction got included into the TxPool.
[+] Couldn't execute the extrinsic due to RpcClient(Client(Call(Custom(ErrorObject { code: ServerError(1002), message: "Verification Error: Runtime error: Execution failed: Runtime panicked: Bad input data provided to validate_transaction: Could not decode `RuntimeCall::System.0`:\n\tCould not decode `Call`, variant doesn't exist\n", data: Some(RawValue("RuntimeApi(\"Execution failed: Runtime panicked: Bad input data provided to validate_transaction: Could not decode `RuntimeCall::System.0`:\\n\\tCould not decode `Call`, variant doesn't exist\\n\")")) }))))

It is therefore an issue of ws-client and tungstenite rpc-client

[haerdib]

Update: A warning is also produced if everything runs through okay (see #620 (comment)).

[2023-07-24T13:20:33Z INFO  substrate_api_client::rpc::ws_client] got on_subscription_msg {"jsonrpc":"2.0","result":"DaTgmIttoXLra0b1","id":"1"}
[2023-07-24T13:20:33Z WARN  substrate_api_client::rpc::ws_client] Expected subscription, but received an id response instead: Object {"id": String("1"), "jsonrpc": String("2.0"), "result": String("DaTgmIttoXLra0b1")}
[2023-07-24T13:20:33Z DEBUG ws::handler] Handler received: 
    <FRAME>
    final: true
    reserved: false false false
    opcode: TEXT
    length: 115
    payload length: 113
    payload: 0x7b226a736f6e727063223a22322e30222c226d6574686f64223a22617574686f725f65787472696e736963557064617465222c22706172616d73223a7b22737562736372697074696f6e223a22446154676d4974746f584c7261306231222c22726573756c74223a227265616479227d7d
                
[2023-07-24T13:20:33Z INFO  substrate_api_client::rpc::ws_client] got on_subscription_msg {"jsonrpc":"2.0","method":"author_extrinsicUpdate","params":{"subscription":"DaTgmIttoXLra0b1","result":"ready"}}

So I suppose the warning is wrong, but one needs to differ between the messages:

1. If the "result" is a String with the subscription ID, that's fine. No need to issue a warning
2. If there's not "result" but an "error" instead, that should result in a returned error

[clangenb]

Still there on https://github.com/scs/substrate-api-client/tree/polkadot-v0.9.42-tag-v0.14.0