LRA: expose WebClient configurations

[rmacario]

Environment Details

• Helidon Version: 2.5.1
• Helidon MP
• JDK version: 15.0.2
• OS: Linux
• Docker version (if applicable):

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Problem Description

It seems to be impossible to override default configurations in the global WebClient (io.helidon.webclient.NettyClient) and without that I can't use LRA with a proxy, because his WebClient instantiation is transparent to the dev (io.helidon.lra.coordinator.client.narayana.NarayanaClient#prepareWebClient).

So, after some investigation I ended with the follow doubts:
1- Is it possible to overrides the default configurations defineds on NettyClient ?

        Config globalConfig = Contexts.globalContext().get(Config.class).orElseGet(Config::empty);
        GLOBAL_CLIENT_CONFIG = globalConfig.get("client");

2- Would not be better to accept the default systems properties like http.proxyHost, etc ?
3- Assuming that it is possible to override these configurations (proxy, timeout, etc) programatically, is it possible also to define it by the property files ?

[spericas]

@rmacario I suggest that you use the #helidon-users Slack channel for questions, not a Github issue.