(puppetlabsGH-40) Use sidecar to retrieve puppet information

Previously a sidecar process was introduced to query puppet for information,
however the Language Server was yet to take advantage of it.  This commit
modifies the Puppet Helper in the Language Server to use the sidecar instead.

This commit also uses a queueing mechanism to throttle the sidecar and ensure
that if there are duplicate sidecar requests, only the most recent is processed.
This ensures that that CPU and memory use is capped, but still maintains a good
repsonse time and user experience.

lib/puppet-languageserver.rb

@@ -13,6 +13,7 @@
     validation_queue
     server_capabilities
     sidecar_protocol
+    sidecar_queue
     puppet_parser_helper
     puppet_helper
     facter_helper
@@ -151,17 +152,17 @@ def self.init_puppet_worker(options)
 
     log_message(:info, "Using Facter v#{Facter.version}")
     if options[:preload_puppet]
-      log_message(:info, 'Preloading Puppet Types (Sync)...')
-      PuppetLanguageServer::PuppetHelper.load_types
+      log_message(:info, 'Preloading Puppet Types (Async)...')
+      PuppetLanguageServer::PuppetHelper.load_default_types_async
 
       log_message(:info, 'Preloading Facter (Async)...')
       PuppetLanguageServer::FacterHelper.load_facts_async
 
       log_message(:info, 'Preloading Functions (Async)...')
-      PuppetLanguageServer::PuppetHelper.load_functions_async
+      PuppetLanguageServer::PuppetHelper.load_default_functions_async
 
       log_message(:info, 'Preloading Classes (Async)...')
-      PuppetLanguageServer::PuppetHelper.load_classes_async
+      PuppetLanguageServer::PuppetHelper.load_default_classes_async
     else
       log_message(:info, 'Skipping preloading Puppet')
     end

lib/puppet-languageserver/message_router.rb

@@ -23,9 +23,9 @@ def receive_request(request)
         request.reply_result(LanguageServer::PuppetVersion.create('puppetVersion'   => Puppet.version,
                                                                   'facterVersion'   => Facter.version,
                                                                   'factsLoaded'     => PuppetLanguageServer::FacterHelper.facts_loaded?,
-                                                                  'functionsLoaded' => PuppetLanguageServer::PuppetHelper.functions_loaded?,
-                                                                  'typesLoaded'     => PuppetLanguageServer::PuppetHelper.types_loaded?,
-                                                                  'classesLoaded'   => PuppetLanguageServer::PuppetHelper.classes_loaded?))
+                                                                  'functionsLoaded' => PuppetLanguageServer::PuppetHelper.default_functions_loaded?,
+                                                                  'typesLoaded'     => PuppetLanguageServer::PuppetHelper.default_types_loaded?,
+                                                                  'classesLoaded'   => PuppetLanguageServer::PuppetHelper.default_classes_loaded?))
 
       when 'puppet/getResource'
         type_name = request.params['typename']