[sakibraza-dev]

Description

Adds a CodeCritter: Rename Pet command that allows users to rename their pet through an input box.

• Saves the new pet name to the global codecritter.petName setting.
• Prevents empty names and names longer than 20 characters.
• Adds an entry to the changelog.

Fixes #8

Type of change

• New feature (non-breaking change that adds functionality)
• This change requires a documentation update

How Has This Been Tested?

• Manual test in VS Code Extension Development Host

Tested empty-name validation and the 20-character limit.

Checklist

• My code follows the style guidelines of this project
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• My changes generate no new warnings/errors in the console