✨ Support for <fieldset> and <legend> tags

[MarkusJohansen]

Is your feature request related to a problem? Please describe.
According to GeeksForGeeks: The

tag in HTML5 is used to make a group of related elements in the form. This tag is a new addition in HTML5, serving as a container for grouping form elements. The tag is used to define the title for the child’s contents.

There is currently no styling for fieldset tags in chimera, and adding it would give the developer more flexibility when using Chimera.

Describe the solution you'd like
Implement styling for fieldset and legend tags, that is consistent with our design philosophy. It should also look good across all themes

Additional context
Under the section for unimplemented elements at chimera demo page, the tags are implemented. It could be useful to use this page as a reference when changing the element to ensure consistency with the rest of the design.