(Feature request) Custom template for autocomplete/select options

#### Bug, feature request, or proposal:
Feature request

#### What is the expected behavior?
Possibility to use autocomplete or select with custom templates to show styled options, like on Angular Material for AngularJS autocomplete [here](https://material.angularjs.org/1.0.2/demo/autocomplete).

Example:


#### What is the current behavior?
All options are shown using a single line option template.

#### What are the steps to reproduce?
It can be seen on the docs [here](https://material.angular.io/components/autocomplete/examples).

#### What is the use-case or motivation for changing an existing behavior?
Allowing the customization of the options for the autocomplete/select can help creating a better user experience.

从链接的 Angular Material autocomplete 示例开始，并将其与此 issue 中描述的当前 autocomplete/select 行为进行比较。定义自定义范围，并验证 autocomplete 和 select 选项能够显示带样式的多行内容，同时保留其现有行为。

由索引模型根据 Issue 内容生成。