Accept multiple JSON serialization contexts in DI

[mtmk]

Proposed change

public NatsBuilder AddJsonSerialization(params JsonSerializerContext[] contexts)
    => ConfigureOptions(opts =>
    {
        var jsonRegistry = new NatsJsonContextSerializerRegistry(contexts);
        return opts with { SerializerRegistry = jsonRegistry };
    });

...or collect them to add them in the end during build:

public NatsBuilder AddJsonSerialization(params JsonSerializerContext[] contexts)
    => _contexts.AddRange(contexts);

cc @rickdotnet

[rickdotnet]

I rushed this original implementation and missed that NatsJsonContextSerializerRegistry took in params.

If I pick this up, I'll probably opt for the first option unless someone has opinions against it.

[rickdotnet]

@mtmk , should we wait to see where #530 goes? Or do you think it's worth getting this in sooner?

[mtmk]

@mtmk , should we wait to see where #530 goes? Or do you think it's worth getting this in sooner?

@rickdotnet yes good idea. There might be multiple issues and PRs. I might also create a project or milestone for these as well once we have consensus.