Move replicate_into_scene to server module

[Shatur]

Also make its test integrational since its more a of a public API test.

[codecov-commenter]

Codecov Report

All modified lines are covered by tests ✅

Comparison is base (c497dae) 94.79% compared to head (f8785f1) 94.79%.

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Additional details and impacted files

@@           Coverage Diff           @@
##           master      #64   +/-   ##
=======================================
  Coverage   94.79%   94.79%           
=======================================
  Files          11       11           
  Lines         807      807           
=======================================
  Hits          765      765           
  Misses         42       42           

Files	Coverage Δ
src/lib.rs	100.00% <ø> (ø)
src/replicon_core/replication_rules.rs	100.00% <ø> (ø)
src/server.rs	97.33% <100.00%> (+0.36%)	⬆️

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