Improve AnalysisService and PSScriptAnalyzer integration (#1179)

- Allows on-demand disabling of the AnalysisService when the configuration changes
- Adds a ConfigurationChanged event so that things to can subscribe to it early on
- Decouples the analysis service from the engine running the analysis
- Improves cancellation of script analysis, so that requests are more easily cancelled by the server and when a new request is received
- Moves some analysis-specific logic to within the analysis service
- Improve code-action handling, fixing them on Windows and improving how we pass around diagnostic information between requests

Author: rjmholt

src/PowerShellEditorServices/Server/PsesServiceCollectionExtensions.cs

@@ -43,14 +43,7 @@ public static IServiceCollection AddPsesLanguageServices(
                             .Wait();
                         return extensionService;
                     })
-                .AddSingleton<AnalysisService>(
-                    (provider) =>
-                    {
-                        return AnalysisService.Create(
-                            provider.GetService<ConfigurationService>(),
-                            provider.GetService<OmniSharp.Extensions.LanguageServer.Protocol.Server.ILanguageServer>(),
-                            provider.GetService<ILoggerFactory>().CreateLogger<AnalysisService>());
-                    });
+                .AddSingleton<AnalysisService>();
         }
 
         public static IServiceCollection AddPsesDebugServices(