Build: add @grafana/data package (#17436)

first step in moving non-ui components to their own package

scripts/grunt/default_task.js

@@ -34,8 +34,8 @@ module.exports = function(grunt) {
   grunt.registerTask('no-only-tests', function() {
     var files = grunt.file.expand(
       'public/**/*@(_specs|.test).@(ts|js|tsx|jsx)',
-      'packages/grafana-ui/**/*@(_specs|.test).@(ts|js|tsx|jsx)',
-      'packages/grafana-runtime/**/*@(_specs|.test).@(ts|js|tsx|jsx)'
+      'packages/grafana-data/**/*@(_specs|.test).@(ts|js|tsx|jsx)',
+      'packages/**/*@(_specs|.test).@(ts|js|tsx|jsx)'
     );
     grepFiles(files, '.only(', 'found only statement in test: ');
   });