Support encrypted colls in FunctionalTestCase::createCollection

[jmikola]

Removes a TODO for PHPLIB-1145, which was resolved as "won't fix". If you haven't read the original PR in #1075 though, you should. Some of @GromNaN's first work! 👏

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 87.77%. Comparing base (6cf2021) to head (a93bce7).
⚠️ Report is 2 commits behind head on v2.x.
✅ All tests successful. No failed tests found.

Additional details and impacted files

@@             Coverage Diff              @@
##               v2.x    #1820      +/-   ##
============================================
- Coverage     87.88%   87.77%   -0.11%     
- Complexity     3194     3205      +11     
============================================
  Files           426      427       +1     
  Lines          6345     6388      +43     
============================================
+ Hits           5576     5607      +31     
- Misses          769      781      +12     

Flag	Coverage Δ
6.0-replica_set	86.56% <ø> (+0.68%)	⬆️
6.0-server	82.62% <ø> (+0.71%)	⬆️
6.0-sharded_cluster	86.34% <ø> (+0.69%)	⬆️
8.0-replica_set	87.63% <ø> (-0.17%)	⬇️
8.0-server	83.39% <ø> (+0.64%)	⬆️
8.0-sharded_cluster	87.46% <ø> (-0.17%)	⬇️

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[GromNaN]

It should target 2.1?