[15.0][ADD] rma_readonly

[AaronHForgeFlow]

Added readonly group for users with just need readonly access

Integrate also with rma_account in the module rma_account_readonly

cc @ForgeFlow

[codecov-commenter]

Codecov Report

Merging #457 (cc0e61f) into 15.0 (3420ff9) will not change coverage.
The diff coverage is n/a.

Additional details and impacted files

@@           Coverage Diff           @@
##             15.0     #457   +/-   ##
=======================================
  Coverage   80.58%   80.58%           
=======================================
  Files         152      152           
  Lines        4868     4868           
  Branches      756      756           
=======================================
  Hits         3923     3923           
  Misses        731      731           
  Partials      214      214           

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