The WildFlyElytronClientDefaultSSLContextProvider provider is used to register a JVM wide default SSLContext.

When registering a Java security provider, the type and algorithm of the service that the provider provides must be specified. Currently, the type and algorithm are specified using hardcoded "SSLContext" and "Default" strings as shown here.

Instead of hardcoding these two strings multiple times, we should create two constants and make use of these instead.