Text field/Select padding should be 12px if icon is present

[bonniezhou]

What is the expected behavior?

Padding between edge of text field and icon should be 12px for both leading and trailing icons

What is the actual behavior?

https://material-components.github.io/material-components-web-catalog/#/component/text-field

• Left padding with leading icon is 16px for both outlined and filled text fields
• Right padding with trailing icon is 16px for outlined text fields

[williamernest]

This Issue should also cover the mdc-select component, since the select and text fields are closely related.