feat(typeorm): add a compoennt for TypeORM integration

extensions/typeorm/.npmrc

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+package-lock=true

extensions/typeorm/LICENSE

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+Copyright (c) IBM Corp. 2020. All Rights Reserved.
+Node module: @loopback/typeorm
+This project is licensed under the MIT License, full text below.
+
+--------
+
+MIT license
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in
+all copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+THE SOFTWARE.

extensions/typeorm/README.md

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+# @loopback/typeorm
+
+This module contains a component to provide integration with
+[TypeORM](https://typeorm.io/).
+
+## Installation
+
+```sh
+npm install --save @loopback/typeorm
+```
+
+## Basic use
+
+{% include note.html content="*this.configure()* must be called before *this.component()* to take effect. This is a [known limitation](https://github.com/strongloop/loopback-next/issues/4289#issuecomment-564617263)." %}
+
+The component should be loaded in the constructor of your custom Application
+class.
+
+Start by importing the component class:
+
+```ts
+import {TypeOrmComponent} from '@loopback/typeorm';
+```
+
+In the constructor, add the component to your application:
+
+```ts
+this.component(TypeOrmComponent);
+```
+
+## Contributions
+
+- [Guidelines](https://github.com/strongloop/loopback-next/blob/master/docs/CONTRIBUTING.md)
+- [Join the team](https://github.com/strongloop/loopback-next/issues/110)
+
+## Tests
+
+Run `npm test` from the root folder.
+
+## Contributors
+
+See
+[all contributors](https://github.com/strongloop/loopback-next/graphs/contributors).
+
+## License
+
+MIT

extensions/typeorm/index.d.ts

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+// Copyright IBM Corp. 2020. All Rights Reserved.
+// Node module: @loopback/typeorm
+// This file is licensed under the MIT License.
+// License text available at https://opensource.org/licenses/MIT
+
+export * from './dist';

extensions/typeorm/index.js

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+// Copyright IBM Corp. 2020. All Rights Reserved.
+// Node module: @loopback/typeorm
+// This file is licensed under the MIT License.
+// License text available at https://opensource.org/licenses/MIT
+
+module.exports = require('./dist');

extensions/typeorm/index.ts

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+// Copyright IBM Corp. 2020. All Rights Reserved.
+// Node module: @loopback/typeorm
+// This file is licensed under the MIT License.
+// License text available at https://opensource.org/licenses/MIT
+
+// DO NOT EDIT THIS FILE
+// Add any additional (re)exports to src/index.ts instead.
+export * from './src';