feat: display "Users and Permissions" plugin Roles and their permissions, add user creation/invitation for the "Users and Permissions" plugin, refactor the settings section

[mihailkitrozoskicodechem]

Added new "Plugins" section in the "settings". The new section "Roles and Permissions plugin" displays the Roles and their permissions on all the endpoints.
Added new User creation / email invitation flow (depending wether the IEmailService is configured) for the "Users and Permissions" plugin.
Refactored the settings side bar by extracting the logic into dedicated components

TODO:

• there is a lot of duplicate code between the "regular user" and "users and permissions plugin" for the new user creation/invitation flow, it should be extracted as a common logic.
• Add password reset option via the email service
• implement the logic behind the allowed/not allowed button on the "Roles and permissions" section

What Changed?

• display "Users and Permissions" plugin Roles and their permissions
• add user creation/invitation for the "Users and Permissions" plugin
• refactored the settings component

Type of Change

• ✨ New feature (adds new functionality without breaking existing features)

Review Checklist

• My code follows the project's style and conventions
• I've reviewed my own code for obvious issues
• I've added comments where the code might be confusing
• I've updated relevant documentation (if needed)
• I've tested my changes and they work as expected

Screenshots / Additional Context