new: add _hosts to BaseConnection

[aMahanna]

Allows us to access database hosts without having to work with _url_prefixes instead

[codecov-commenter]

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Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 95.95%. Comparing base (8e6aaca) to head (26e482a).

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Additional details and impacted files

@@           Coverage Diff           @@
##             main     #353   +/-   ##
=======================================
  Coverage   95.94%   95.95%           
=======================================
  Files          26       26           
  Lines        4296     4297    +1     
=======================================
+ Hits         4122     4123    +1     
  Misses        174      174           

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