feat: add app extra/unset env config

to fix #8667 you can
- subpath:"/FoxitReader" appExtraEnvironments : "QT_QPA_PLATFORM=xcb"
- subpath:"/FoxitReader" appEnvironmentsBlacklist : "QT_QPA_PLATFORM"

```
dde-dconfig set -a org.deepin.dde.application-manager -r org.deepin.dde.application-manager -k appExtraEnvironments -s "/FoxitReader" -v "[\"QT_QPA_PLATFORM=xcb\"]"
dde-dconfig set -a org.deepin.dde.application-manager -r org.deepin.dde.application-manager -k appEnvironmentsBlacklist -s "/FoxitReader" -v "[\"QT_QPA_PLATFORM\"]"
```

Issue: https://github.com/linuxdeepin/developer-center/issues/8667

misc/dsg/configs/dde-application-manager/org.deepin.dde.application-manager.json

@@ -0,0 +1,26 @@
+{
+    "magic": "dsg.config.meta",
+    "version": "1.0",
+    "contents": {
+        "appExtraEnvironments": {
+            "value": [],
+            "serial": 0,
+            "flags": [],
+            "name": "Launching app with extra environments",
+            "name[zh_CN]": "启动应用时附加额外环境变量",
+            "description": "Launching app with extra environments",
+            "permissions": "readwrite",
+            "visibility": "public"
+        },
+        "appEnvironmentsBlacklist": {
+            "value": [],
+            "serial": 0,
+            "flags": [],
+            "name": "Ignore blacklisted environment variables before launching app",
+            "name[zh_CN]": "启动应用时取消某些环境变量",
+            "description": "Ignore blacklisted environment variables before launching app",
+            "permissions": "readwrite",
+            "visibility": "public"
+        }
+    }
+}