feat(textbox): prefix & postfix

[LuLaValva]

[!IMPORTANT]

• Must be reviewed while linked with eBay/skin#2353

Description

• Add @prefix-text and @postfix-text
• Move class names into the parent textbox
• Include focus and blur event handlers, to be removed after full support for :has

Screenshots

[changeset-bot[bot]]

🦋 Changeset detected

Latest commit: 353a9b1dfbed0439f5d5a89112f81358a6d717f4

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 1 package

| Name | Type | | ----------------- | ----- | | @ebay/ebayui-core | Minor |

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