Expose replication groups at runtime

[tyoeer]

Closes #362

This makes core::replication::replication_rules::ReplicationRules public.
Unpublished changes have already made the ComponentId publicly accessible (the removal of FnsInfo from a quick look), so there's no longer any change required.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 89.69%. Comparing base (031bef8) to head (dfb1b52).
Report is 1 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #365   +/-   ##
=======================================
  Coverage   89.69%   89.69%           
=======================================
  Files          44       44           
  Lines        2445     2445           
=======================================
  Hits         2193     2193           
  Misses        252      252           

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