Proposal to rename rbenv_map_bins to ruby_map_bins

in https://github.com/capistrano/rvm we have rvm_map_bins
in https://github.com/capistrano/rbenv we have rbenv_map_bins
in https://github.com/capistrano/chruby we have chruby_map_bins

Any gem that try extend this arrays , will need to have 3 `append` to be compatible with all version managers.

I propose to soft deprecated the *_map_bins to ruby_map_bins .

If there is an approval, i will open a PR in the all the repos that are affected.

Start by comparing the rvm_map_bins, rbenv_map_bins, and chruby_map_bins interfaces in the linked Capistrano repositories. Confirm which affected repositories and compatibility expectations are in scope; done should be a coordinated, approved rename with a soft-deprecation path for the existing names.

Written by the indexing model from the issue text.