Make NullContext an alias of ContextBase

[vstolin]

Make NullContext an alias of ContextBase

[github-actions]

Test Results

479 tests  +1   475 ✅ +1   40s ⏱️ ±0s
  1 suites ±0     4 💤 ±0 
  1 files   ±0     0 ❌ ±0 

Results for commit 50179c9. ± Comparison against base commit 250e95d.

♻️ This comment has been updated with latest results.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 95.35%. Comparing base (250e95d) to head (50179c9).
⚠️ Report is 9 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #166   +/-   ##
=======================================
  Coverage   95.35%   95.35%           
=======================================
  Files         130      130           
  Lines        7769     7777    +8     
  Branches      510      511    +1     
=======================================
+ Hits         7408     7416    +8     
  Misses        245      245           
  Partials      116      116           

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