export mock synapse

[benwainwright]

📬 Changes

In your documentation you mention a helper library that helps synapse work with tests.

We can't use it though, because its not been exported from the package. This PR fixes that.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 63.17%. Comparing base (a01181f) to head (02c4af4).
⚠️ Report is 2 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #178   +/-   ##
=======================================
  Coverage   63.17%   63.17%           
=======================================
  Files          53       53           
  Lines        1127     1127           
  Branches      162      162           
=======================================
  Hits          712      712           
  Misses        399      399           
  Partials       16       16           

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[zoe-codez]

lgtm