feat: add CSS part for content wrapper

[StephenRiosDev]

Alaska Airlines Pull Request

Please include a summary of the change and which issue is fixed. Please also include relevant motivation and context. List any dependencies that are required for this change.

Checklist:

• My update follows the CONTRIBUTING guidelines of this project
• 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.

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-- Auro Design System Team

Summary by Sourcery

New Features:

• Expose the button's content wrapper span as a CSS part named "contentWrapper" for external styling

[sourcery-ai]

Reviewer's guide (collapsed on small PRs)

Reviewer's Guide

Introduces a new CSS part for the AuroButton content wrapper, enabling external styling of the button’s inner container.

File-Level Changes

Change	Details	Files
Expose content wrapper as a CSS part	Added part="contentWrapper" attribute to the wrapping the button content	src/auro-button.js

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[sourcery-ai]

Hey there - I've reviewed your changes and they look great!

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[github-actions]

Surge demo deployment failed! 😭

[blackfalcon]

🎉 This PR is included in version 11.5.0 🎉

The release is available on:

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

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