Enhance Guardian UI Form to Support Rich Text

When authoring Guardian schemas and forms I want to emphasize important information in a structured and clear way using headings, lists, links, and text styles to avoid misinterpretation and support better readability.

## Requirements

Authors can format text so that rendered output will be styles. Integrates with third party systems such as project hub and the hedera network.

## Acceptance criteria

* support for headings, bold, italics
* bulleted and numbered lists
* hyperlinks
* formatting preserved when displayed in final output
* Existing plain text entries remain unaffected and display as expected

## Additional Notes

* data stored as markdown
* additional field type for rich text support added to schemas
* authors of existing policies will need to be update their policies opt in to receive rich text fields
* we will not update any policies to automatcially change existing fields to rich text
* decided to leave existing policies alone and in VCS v5.0 fields can be updated via templates to include rich text