Feature: Improve ReductClient initialization

[atimin]

Current problem

Client initialization is verbose and counter-intuitive:

        ServerProperties properties = new ServerProperties(false, "127.0.0.1", 8383);
        HttpClient httpClient = HttpClient.newHttpClient();
        ReductClient client = new ReductClient(properties, httpClient, "my-token");

Possible solution

Let's pass the URL and token to ServerProperties and use the builder pattern because in the future we will need timeout and other options:

        ServerProperties properties = ServerProperties
            .url(:http://127.0.0.1:8383)
            .apiToken("my-token");

        HttpClient httpClient = HttpClient.newHttpClient();
        ReductClient client = new ReductClient(properties, httpClient);

Additionally, lets add a constructor with a default HTTP client.

Additional context

No response

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[Rumpelshtinskiy]

I've started to work on the issue