Adding jdalley.toggle-hdr extension to the gallery

[jdalley]

Extension Submission

Thanks for submitting your extension to the Command Palette Extensions Gallery!
Please fill out the checklist below to help us review your PR quickly.

Checklist

• My folder follows the <author>/<extension-name> convention (lowercase, alphanumeric + hyphens only)
• I have added an extension.json with all required fields
• The id field in my extension.json matches my folder path (author.extension-name)
• I have added an icon file (PNG or SVG, under 100 KB)
• The icon field in extension.json matches my icon filename
• My extension is available at the install source I specified (winget/MS Store/URL)
• I have read the Contributing Guide

Additional context

Thanks folks!