(maint) Improve extension logging

This commit changes the configuration in package.json to show the logging levels
are an enum, not free text, and adds timestamps to the log messages.

Author: glennsarti

client/package.json

@@ -255,7 +255,8 @@
         "puppet.languageclient.minimumUserLogLevel": {
           "type": "string",
           "default": "normal",
-          "description": "Set the minimum log level that the user will see on the Puppet OutputChannel (Allowed values: verbose, debug, normal, warning, error)"
+          "description": "Set the minimum log level that the user will see on the Puppet connection logs",
+          "enum": ["verbose", "debug", "normal", "warning", "error" ]
         },
         "puppet.puppetAgentDir": {
           "type": "string",

client/src/logging.ts

@@ -57,7 +57,7 @@ export class Logger {
   }
 
   private logWithLevel(level: LogLevel, message) {
-    let logMessage = this.logLevelPrefixAsString(level) + message
+    let logMessage = this.logLevelPrefixAsString(level) + (new Date().toISOString()) + ' ' + message
 
     console.log(logMessage);
     if (level >= this.minimumUserLogLevel) {