feat: add method to get pagination cursor for single entity

[wschurman]

Why

In a decent number of tests in the Expo server application, it's useful to test pagination from a specific point. It may also be useful for production code in an thus far unbeknownst way.

To do this, one must be able to generate the cursor given an entity. This PR adds such a method.

How

Add the method that creates a cursor.

Test Plan

Run the new test.

[wschurman]

• fix: correct pagination behavior for standard pagination with descending ordering clauses #477
• fix: correct precedence parentheses for SQLFragment joins #476
• feat: add method to get pagination cursor for single entity #475 👈 (View in Graphite)
• fix: correct discriminated union type for forward/backward pagination #474
• feat: support nullable search fields with postgres transforms #470
• fix: Apply same viewer context subclass type mechanism to knexLoader and related methods #472
• main

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 100.00%. Comparing base (90ae6e2) to head (4b52611).
⚠️ Report is 3 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##              main      #475    +/-   ##
==========================================
  Coverage   100.00%   100.00%            
==========================================
  Files          110       110            
  Lines        16159     16183    +24     
  Branches       869      1440   +571     
==========================================
+ Hits         16159     16183    +24     

Flag	Coverage Δ
integration	24.09% <100.00%> (+0.11%)	⬆️
unittest	95.01% <75.00%> (-0.03%)	⬇️

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[wschurman]

Merge activity

• Feb 27, 2:15 AM UTC: A user started a stack merge that includes this pull request via Graphite.
• Feb 27, 2:24 AM UTC: Graphite rebased this pull request as part of a merge.
• Feb 27, 2:27 AM UTC: @wschurman merged this pull request with Graphite.