add 'ceiling rack' form-factor for rack types

[goteamkor]

NetBox version

v4.1-beta1

Feature type

Change to existing functionality

Proposed functionality

I was looking through the pull request for #16739 (adding rack types), and noticed the following form factors are part of the implementation.

A rack can be designated as one of the following types:

• 2-post frame
• 4-post frame
• 4-post cabinet
• Wall-mounted frame
• Wall-mounted cabinet

You might consider also adding the 'ceiling-mounted' form type.
https://www.atlasied.com/ceiling-racks
https://www.chatsworth.com/en-us/products/cabinets-enclosures-containment/telecommunications-enclosures/drop-ceiling

Use case

I've seen a few K-12 schools use these ceiling mounted racks in a few situations. They exist.

Database changes

none

External dependencies

none

[github-actions]

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[abhi1693]

@jeremystretch I'd like to take this.