mat-icon: Choose between Filled, Outlined, Rounded, Two-Tone and Sharp icons;

#### Please describe the feature you would like to request.
To be able to select between Filled, Outlined, Rounded, Two-Tone and Sharp when using mat-icon;

#### What is the use-case or motivation for this proposal?
An easy way to use the new icons available on https://material.io/tools/icons/?style=baseline (without having to manually put the SVG's of the icons you want)

首先检查链接的 Material Design icons 页面上的 mat-icon 实现和 Material Icons 样式。确定应如何通过 mat-icon 提供 Filled、Outlined、Rounded、Two-Tone 和 Sharp 这些选项，然后验证无需手动提供 SVG 文件即可选择每种样式。

由索引模型根据 Issue 内容生成。