Add cluster UI block injection token and current implementation as a Feature

Signed-off-by: Juho Heikka <juho.heikka@gmail.com>

packages/metrics/.eslintrc.js

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+module.exports = {
+    extends: "@k8slens/eslint-config/eslint",
+    parserOptions: {
+      project: "./tsconfig.json",
+    },
+  };

packages/metrics/.prettierrc

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+"@k8slens/eslint-config/prettier"

packages/metrics/index.ts

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+/**
+ * Copyright (c) OpenLens Authors. All rights reserved.
+ * Licensed under MIT License. See LICENSE in root directory for more information.
+ */
+
+import type React from "react";
+import { getInjectionToken } from "@ogre-tools/injectable";
+
+export type ClusterOverviewUIBlock = {
+  id: string;
+  Component: React.ElementType;
+  orderNumber: number;
+};
+
+export const clusterOverviewUIBlockInjectionToken = getInjectionToken<ClusterOverviewUIBlock>({
+  id: "cluster-overview-ui-block-injection-token",
+});

packages/metrics/jest.config.js

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+module.exports = require("@k8slens/jest").monorepoPackageConfig(__dirname).configForReact;

packages/metrics/package.json

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+{
+    "name": "@k8slens/metrics",
+    "private": false,
+    "version": "6.5.0-alpha.1",
+    "description": "Code that is common to all Features and those registering them.",
+    "type": "commonjs",
+    "publishConfig": {
+      "access": "public",
+      "registry": "https://registry.npmjs.org/"
+    },
+    "files": [
+      "dist"
+    ],
+    "repository": {
+      "type": "git",
+      "url": "git+https://github.com/lensapp/lens.git"
+    },
+    "main": "dist/index.js",
+    "types": "dist/index.d.ts",
+    "author": {
+      "name": "OpenLens Authors",
+      "email": "info@k8slens.dev"
+    },
+    "license": "MIT",
+    "homepage": "https://github.com/lensapp/lens",
+    "scripts": {
+      "build": "webpack",
+      "clean": "rimraf dist/",
+      "dev": "webpack --mode=development --watch",
+      "test": "jest --coverage --runInBand",
+      "lint": "lens-lint",
+      "lint:fix": "lens-lint --fix"
+    },
+    "peerDependencies": {
+      "@ogre-tools/injectable": "^15.1.2",
+      "react": "^17.0.2"
+    },
+    "devDependencies": {
+      "@k8slens/eslint-config": "6.5.0-alpha.1"
+    }
+  }

packages/metrics/tsconfig.json

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+{
+    "extends": "@k8slens/typescript/config/base.json",
+    "include": ["**/*.ts"]
+  }

packages/metrics/webpack.config.js

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+module.exports = require("@k8slens/webpack").configForReact;