Simplify application configuration by using only properties where possible

[peneksglazami]

At the moment, if we need to work with several tarantool instances at once, we have to configure and create service beans ourselves.

@Configuration
@PropertySource(value = "classpath:application-tarantool.properties", encoding = "UTF-8")
@EnableTarantoolRepositories(basePackageClasses = UserTarantoolRepository.class)
public class TarantoolConfiguration extends AbstractTarantoolDataConfiguration {

    @Value("${tarantool.nodes}")
    private String nodes;
    @Value("${tarantool.username}")
    private String username;
    @Value("${tarantool.password}")
    private String password;

    @Override
    @Bean("tarantoolClusterAddressProvider")
    public TarantoolClusterAddressProvider tarantoolClusterAddressProvider() {
        List<TarantoolServerAddress> addressList = new ArrayList<>();
        for (String address : nodes.split(",")) {
            String[] parts = address.split(":");
            String host = parts[0];
            int port = Integer.parseInt(parts[1]);
            addressList.add(new TarantoolServerAddress(host, port));
        }

        return () -> addressList;
    }

    @Override
    protected void configureClientConfig(TarantoolClientConfig.Builder builder) {
        builder.withCredentials(new SimpleTarantoolCredentials(username, password));
    }
}

I propose to add the ability to configure the application through a set of properties and assign the logic of their interpretation and application, for example, to AbstractTarantoolDataConfiguration.

For example, we can add support for properties such as

spring.data.tarantool.nodes=localhost:3301,172.1.0.2:3301,172.1.0.3:3303 (default - 127.0.0.1:3301)
spring.data.tarantool.username=admin (default - "guest")
spring.data.tarantool.password=passw0rd (default - "")
spring.data.tarantool.connection-selection-strategy=RoundRobinStrategy (default - "ParallelRoundRobinStrategy")
...

[vrogach2020]

Probably this can be covered by added spring boot starter to the library