Add support for the TLS registry to the WebSocket-Next client extension

[cescoffier]

Description

With the integrated TLS registry, it should be possible to configure the WebSocket Next client using the TLS registry instead of the specific configuration.

Implementation ideas

This is the code used for the mailer:

 private void configureTLS(String name, MailerRuntimeConfig config, TlsConfigurationRegistry tlsRegistry, MailConfig cfg,
            boolean globalTrustAll) {
        TlsConfiguration configuration = null;

        // Check if we have a named TLS configuration or a default configuration:
        if (config.tlsConfigurationName.isPresent()) {
            Optional<TlsConfiguration> maybeConfiguration = tlsRegistry.get(config.tlsConfigurationName.get());
            if (!maybeConfiguration.isPresent()) {
                throw new IllegalStateException("Unable to find the TLS configuration "
                        + config.tlsConfigurationName.get() + " for the mailer " + name + ".");
            }
            configuration = maybeConfiguration.get();
        } else if (tlsRegistry.getDefault().isPresent() && tlsRegistry.getDefault().get().isTlsEnabled()) {
            configuration = tlsRegistry.getDefault().get();
        }

       // Apply the configuration
        if (configuration != null) {
            // This part is often the same (or close) for every Vert.x client:
            cfg.setSsl(true);

            if (configuration.getTrustStoreOptions() != null) {
                cfg.setTrustOptions(configuration.getTrustStoreOptions());
            }

           // For mTLS:
            if (configuration.getKeyStoreOptions() != null) {
                cfg.setKeyCertOptions(configuration.getKeyStoreOptions());
            }

            if (configuration.isTrustAll()) {
                cfg.setTrustAll(true);
            }
            if (configuration.getHostnameVerificationAlgorithm().isPresent()) {
               // ACHTUNG HERE - this is protocol specific. The HTTP-based protocols should use HTTPS by default. 
                cfg.setHostnameVerificationAlgorithm(configuration.getHostnameVerificationAlgorithm().get());
            }

            SSLOptions sslOptions = configuration.getSSLOptions();
            if (sslOptions != null) {
                cfg.setSslHandshakeTimeout(sslOptions.getSslHandshakeTimeout());
                cfg.setSslHandshakeTimeoutUnit(sslOptions.getSslHandshakeTimeoutUnit());
                for (String suite : sslOptions.getEnabledCipherSuites()) {
                    cfg.addEnabledCipherSuite(suite);
                }
                for (Buffer buffer : sslOptions.getCrlValues()) {
                    cfg.addCrlValue(buffer);
                }
                cfg.setEnabledSecureTransportProtocols(sslOptions.getEnabledSecureTransportProtocols());

            }

        } else {
           // Mailer specific configuration (very incomplete as you can see:
            boolean trustAll = config.trustAll.isPresent() ? config.trustAll.get() : globalTrustAll;
            cfg.setSsl(config.ssl);
            cfg.setTrustAll(trustAll);
            applyTruststore(config, cfg);
        }
    }