feat(rbac): list roles

[debsmita1]

Resolves:
#843

Screenshots/GIF:

User not authorized to delete roles

Test setup:
Add this in the rbac-policy.csv
p, user:default/<username>, policy-entity, delete, deny

Screen.Recording.2023-11-27.at.7.33.13.PM.mov

Test setup:

Follow the steps mentioned in the PR #895 and the documentation to install the RBAC UI plugin

[debsmita1]

Updated the GIF @parvathyvr @invincibleJai @divyanshiGupta

[parvathyvr]

@debsmita1 some of the updates to this design are

1. Column name - Members changed to 'Users and groups'
2. Column name- Permission changed to 'Permission policies'
3. Delete icon will be shown all times- if user do not have delete access- we plan to show the delete icon disabled with a tooltip explanation. Figma link
4. The delete modal-included some more context info for the user- referring to the part where we talk about the users and permission policies in that role Eg: 'The 5 users and 12 groups associated with this role will lose access to all the 3 permission policies specified in this role.' Figma link
5. Error scenario in modal design updated- Figma link OR see the generic error message mockup

Let me know if there are any questions-Thank you!