Show a highlight on identified raster pixels when using identify tool

[nyalldawson]

Matches the vector/vector tile/point cloud behaviour of showing the geometry of the identified result in the canvas

Very handy when a identifying a raster which has sections of similar colored pixels and it's difficult to visually determine the exact extent of a pixel.

Peek.2023-09-11.10-48.mp4

[qgis-bot]

@nyalldawson

This pull request has been tagged for the changelog.

• The description will be harvested so please provide a "nearly-ready" text for the final changelog
• If possible, add a nice illustration of the feature. Only the first one in the description will be harvested (GIF accepted as well)
• If you can, it's better to give credits to your sponsor, see below for different formats.

You can edit the description.

Format available for credits

• Funded by NAME
• Funded by URL
• Funded by NAME URL
• Sponsored by NAME
• Sponsored by URL
• Sponsored by NAME URL

Thank you!

[qgis-bot]

@nyalldawson
This pull request has been tagged as requiring documentation.

A documentation ticket will be opened at https://github.com/qgis/QGIS-Documentation when this PR is merged.

Please update the description (not the comments) with helpful description and screenshot to help the work from documentors.
Also, any commit having [needs-doc] or [Needs Documentation] in will see its message pushed to the issue, so please be as verbose as you can.

Thank you!

[nirvn]

Nice papercut

[github-actions]

@nyalldawson
A documentation ticket has been opened at qgis/QGIS-Documentation#8503
It is your responsibility to visit this ticket and add as much detail as possible for the documentation team to correctly document this change.
Thank you!