MSSQL: Add a project.json so NX builds the plugin (#94866)

build(mssql): add a project.json so nx builds the plugin

public/app/plugins/datasource/mssql/project.json

@@ -0,0 +1,9 @@
+{
+  "$schema": "../../../../../node_modules/nx/schemas/project-schema.json",
+  "projectType": "library",
+  "tags": ["scope:plugin", "type:datasource"],
+  "targets": {
+    "build": {},
+    "dev": {}
+  }
+}