Add empty and loading states for Roles table

[apinkert]

Adds empty and loading states for Roles table

RHCLOUD-36309

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 0% with 17 lines in your changes missing coverage. Please review.

Project coverage is 40.63%. Comparing base (186626a) to head (8eb7631).
Report is 1 commits behind head on master.

Files with missing lines	Patch %	Lines
src/smart-components/role/RolesTable.tsx	0.00%	17 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1750      +/-   ##
==========================================
- Coverage   41.25%   40.63%   -0.63%     
==========================================
  Files         201      203       +2     
  Lines        5565     5653      +88     
  Branches     1457     1480      +23     
==========================================
+ Hits         2296     2297       +1     
- Misses       3053     3140      +87     
  Partials      216      216              

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