Expose mongodb transactions

[imnasnainaec]

This allows for combining multiple changes into an atomic, all-or-nothing change. It would be useful for:

• word merging
• project owner transfer

However, to do this, we first have to convert our mongo setup from standalone to a replica set: https://www.mongodb.com/docs/manual/tutorial/convert-standalone-to-replica-set/

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This change is 

[imnasnainaec]

Possibly revisit this after Q1 next year.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 66.67%. Comparing base (0ea1184) to head (4dffa27).
⚠️ Report is 291 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #3484      +/-   ##
==========================================
- Coverage   74.65%   66.67%   -7.98%     
==========================================
  Files         285      234      -51     
  Lines       10999     5821    -5178     
  Branches     1338      706     -632     
==========================================
- Hits         8211     3881    -4330     
+ Misses       2404     1715     -689     
+ Partials      384      225     -159     

Flag	Coverage Δ
backend	?
frontend	65.72% <ø> (-0.96%)	⬇️

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[imnasnainaec]

Waiting on #4183 to be resolved