public Builder pluginClassLoader(ClassLoader pluginClassLoader) {
            this.pluginClassLoader = pluginClassLoader;
            return this;
        }
Sets a ClassLoader that should be used by build plugins when loading
services.

@param pluginClassLoader ClassLoader to use in build plugins.
@return Retruns the builder.
smithy-build/src/main/java/software/amazon/smithy/build/PluginContext.java