Add trace.server

Author: dantleech

package.json

@@ -56,6 +56,32 @@
         "configuration": {
             "title": "Phpactor",
             "properties": {
+                "phpactor.trace.server": {
+                    "scope": "window",
+                    "type": "object",
+                    "description": "Traces the communication between VS Code and the language server.",
+                    "properties": {
+                        "verbosity": {
+                            "type": "string",
+                            "description": "Controls the verbosity of the trace.",
+                            "enum": [
+                                "off",
+                                "message",
+                                "verbose"
+                            ],
+                            "default": "off"
+                        },
+                        "format": {
+                            "type": "string",
+                            "description": "Controls the output format of the trace.",
+                            "enum": [
+                                "text",
+                                "json"
+                            ],
+                            "default": "text"
+                        }
+                    }
+                },
                 "phpactor.path": {
                     "type": [
                         "string",