feat: add support for chips in input

# Feature Request

**Ionic version:**

[x] **4.x**

**Describe the Feature Request**
Support grouping of chips - input type specifically.

**Describe Preferred Solution**
I need to look into the best way to handle this. I think we may need to add an `ion-chip-group` similar to how radio works.

Usage - https://material.io/design/components/chips.html#usage
MD implementation - https://github.com/material-components/material-components-web/tree/master/packages/mdc-chips#adding-chips-to-the-dom
MD demo - https://material-components.github.io/material-components-web-catalog/#/component/chips

**Describe Alternatives**

**Related Code**

**Additional Context**

首先检查现有的 chip 和 radio 组件模式，然后将提议的 ion-chip-group 行为与链接的 Material Design 参考资料进行比较。在确定实现文件和测试之前，先定义分组 API 和 input-chip 交互要求；当分组的 input-chip 按照规范工作并有测试覆盖时，即视为完成。

由索引模型根据 Issue 内容生成。