[sr-dev] [kamailio/kamailio] nats module subscriber issue when connected to more "nats_urls" (Issue #2916)

[Emmanuel Schmidbauer]

This sounds like a nice improvement, I submitted a PR to move the connection handling into a new struct. We can extend it into a linked-list by doing something like this:
![image](https://user-images.githubusercontent.com/7139998/141700502-a56de086-7d5d-4b50-91bc-c22695a9773c.png)

I think we should leave the default behavior of relying on libnats to do connection failover based on the server list it is given, and define a "name" on the connection to create simultaneous connections. 
perhaps using something similar to htable like
```
modparam("nats", "nats_url", "nats://127.0.0.1:4222;name=connection1")
modparam("nats", "nats_url", "nats://127.0.0.1:5222;name=connection1")
modparam("nats", "nats_url", "nats://127.0.0.1:6222;name=connection2")
```

This would create two sets of connections.
"connection1" would contain server list of `nats://127.0.0.1:4222` and `nats://127.0.0.1:5222`
"connection2" would contain server list of `nats://127.0.0.1:6222`
We could then reference the connections by name in other modparams or functions.

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