Support connecting to the database by DNS SRV records

[namco1992]

Is your feature request related to a problem? Please describe.
Connecting to the DB with DNS SRV records is a fairly common approach when you need some load balancing. E.g. MySQL and MongoDB support it. It would be great that the clickhouse-go can support connecting to the server by DNS SRV records.

Describe the solution you'd like
The clickhouse-go can support connecting to the server by DNS SRV records.

It can be set in the DSN with a unique protocol clickhouse+srv://:

clickhouse+srv://username:password@_ch._tcp.example.com/database?xxx

Or controlled by a flag in Options:

type Options struct {
    // Other options
    ResolveSRV bool  // Resolve the DNS SRV records and populate the list of hosts to connect to
}

Describe alternatives you've considered
It is possible to resolve the DNS SRV records outside the driver, and provide the resolved host list to the driver when opening a conn. However, the SRV records need to be continuously resolved as the host list could change. One alternative is that we resolve the DNS and create a new conn every time we interact with the DB, but it feels wasteful and slow.

Additional context
Add any other context or screenshots about the feature request here.