Move in-tree extensions to top-level folder (#993)

Signed-off-by: Jari Kolehmainen <jari.kolehmainen@gmail.com>

extensions/example-extension/README.md

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+# Lens Example Extension
+
+*TODO*: add more info

extensions/example-extension/example-extension.tsx

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+import { Button, DynamicPageType, Icon, IconProps, LensExtension } from "@lens/extensions";
+import React from "react";
+import path from "path";
+
+export default class ExampleExtension extends LensExtension {
+  onActivate() {
+    console.log('EXAMPLE EXTENSION: ACTIVATED', this.getMeta());
+    this.registerPage({
+      type: DynamicPageType.CLUSTER,
+      path: "/extension-example",
+      menuTitle: "Example Extension",
+      components: {
+        Page: () => <ExtensionPage extension={this}/>,
+        MenuIcon: ExtensionIcon,
+      }
+    })
+  }
+
+  onDeactivate() {
+    console.log('EXAMPLE EXTENSION: DEACTIVATED', this.getMeta());
+  }
+}
+
+export function ExtensionIcon(props: IconProps) {
+  return <Icon {...props} material="camera" tooltip={path.basename(__filename)}/>
+}
+
+export class ExtensionPage extends React.Component<{ extension: ExampleExtension }> {
+  deactivate = () => {
+    const { extension } = this.props;
+    extension.runtime.navigate("/")
+    extension.disable();
+  }
+
+  render() {
+    const { TabLayout } = this.props.extension.runtime.components;
+    return (
+      <TabLayout className="ExampleExtension">
+        <div className="flex column gaps align-flex-start">
+          <p>Hello from extensions-api!</p>
+          <p>File: <i>{__filename}</i></p>
+          <Button accent label="Deactivate" onClick={this.deactivate}/>
+        </div>
+      </TabLayout>
+    )
+  }
+}

extensions/example-extension/package.json

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+{
+  "name": "extension-example",
+  "version": "1.0.0",
+  "description": "Example extension",
+  "main": "example-extension.js",
+  "lens": {
+    "metadata": {},
+    "styles": []
+  },
+  "dependencies": {
+  }
+}

extensions/example-extension/tsconfig.json

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+{
+  "extends": "../../tsconfig.json",
+  "compilerOptions": {
+    "outDir": ".",
+    "module": "CommonJS",
+    "sourceMap": false,
+    "declaration": false
+  },
+  "include": [
+    "../../types",
+    "./example-extension.tsx"
+  ]
+}