AdditionalProperties are not supported in FluentUI template

[martinlaukkanen]

Prerequisites

• I have read the documentation;
• In the case of a bug report, I understand that providing a SSCCE example is tremendously useful to the maintainers.
• Ideally, I'm providing a sample JSFiddle or a shared playground link demonstrating the issue.

Description

Hello,
AdditionalProperties do not work in the Fluent UI template, I've followed this issue tracked here for Semantic-ui Bootstrap4 and fluentUI in #1927 plus for MaterialUI #1724 and unfortunately the Fluent version never happened.

So I'm just going to log this here as an open item. I'd love to contribute to this, but time won't be on my side.. :(

Steps to Reproduce

1. Goto https://rjsf-team.github.io/react-jsonschema-form/
2. Select additionalProperties example
3. Select theme fluent-ui

Expected behavior

Actual behavior

Additional properties section has no add new row or remove row.

Version

^4.1.0