[Tab] Add support for full width

[infernova]

Prerequisites

• I have searched for duplicate or closed feature requests
• I have read the contributing guidelines

Proposal

Sample Implementation

Code implementation

src/components/Tab/tab-group.css

:host([fullWidth][orientation="horizontal"]) slot[name="nav"]::slotted(sgds-tab) {
  width: 100%;
}

src/components/Tab/tab.css

:host([fullWidth][orientation="horizontal"]) .tab {
  justify-content: center;
}

Motivation and context

We have some use cases in Product Portal for a full width tab so I thought it would be more efficient to implement this at the SGDS level rather than the product level

[clukhei]

Pending triage by @anzteng