feat: add fluid attribute

[MattSidor]

Alaska Airlines Pull Request

Fixes: #137

Summary:

Adds a fluid attribute which alters the width of the CTA button (type="cta") to fill the full width of its parent container.

Type of change:

• [X] New capability

Checklist:

• [X] My update follows the CONTRIBUTING guidelines of this project
• [X] I have performed a self-review of my own update

By submitting this Pull Request, I confirm that my contribution is made under the terms of the Apache 2.0 license.

[blackfalcon]

:tada: This PR is included in version 3.2.0 :tada:

The release is available on:

• npm package (@latest dist-tag)
• GitHub release

Your semantic-release bot :package::rocket: