Querying via UDP is not supported

When I used UDP client to query, case panic: Querying via UDP is not supported

code summary:
```go
c, err = client.NewUDPClient(client.UDPConfig{
Addr: alc.InfluxDBAddr,
})
...
client.NewQuery(fmt.Sprintf("CREATE DATABASE %s", "testdb"), "", "")
response, err := c.Query(q)
```

Start at client.NewUDPClient and the c.Query(q) call shown in the report, then reproduce the panic with the provided CREATE DATABASE query. Trace how UDP requests are handled and clarify the intended behavior for queries; done means the issue has an agreed implementation scope and verified behavior rather than an unsupported panic.

Written by the indexing model from the issue text.