feat: add forUpdate to knex loader

[wschurman]

Why

One common reason Expo engineers need to drop down to raw knex is that they need to use forUpdate to lock a row/rows during a transaction. This adds the functionality to entity.

How

Add forUpdate to knex SQL loader methods. Note that this requires being in a transaction and asserts it.

Test Plan

Run updated tests.

[wschurman]

• feat: add forUpdate to knex loader #704 👈 (View in Graphite)
• main

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 100.00%. Comparing base (9629e36) to head (747f6e9).
⚠️ Report is 4 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##              main      #704    +/-   ##
==========================================
  Coverage   100.00%   100.00%            
==========================================
  Files          109       109            
  Lines        18046     18093    +47     
  Branches       941      1546   +605     
==========================================
+ Hits         18046     18093    +47     

Flag	Coverage Δ
integration	28.59% <98.00%> (+0.33%)	⬆️
unittest	94.81% <82.00%> (+0.15%)	⬆️

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