Add markdown and/or sanitized HTML support to Computed Fields

[gioccher]

As ...

Ozzie - Operator

I want ...

To view data produced by computed fields formatted using markdown and/or HTML

So that ...

Computed Fields can output more than just a single line of plain text.
Examples:

• checkmarks
• bullet points
• pre-formatted paragraphs
• ...

I know this is done when...

• users with permission to create or edit computed fields can have them render markdown or safe HTML

This could be implemented either by:

• supporting expressions like {{ True | render_boolean }} {{ "<b>hello world</b>" | safe }} {{ "```\ncode block\n```" | render_markdown }}
• or introducing a "Type" dropdown with options like Plain Text, Markdown, and HTML

Optional - Feature groups this request pertains to.

• Automation
• Circuits
• DCIM
• IPAM
• Misc (including Data Sources)
• Organization
• Plugins (and other Extensibility)
• Security (Secrets, etc)
• Image Management
• UI/UX
• Documentation
• Other (not directly a platform feature)

Database Changes

No response

External Dependencies

No response

[gioccher]

from @glennmatthews in slack:

We had to lock down the use of HTML in computed fields due to security risks (GHSA-cf9f-wmhp-v4pr); that said, I think the current implementation may be stricter than absolutely necessary and we could probably loosen it back up by adding support for markdown and sanitized HTML, similar to what was done in #5133.