chore: enable strictNullChecks globally

[JKRhb]

As another step towards resolving #1046, this PR enables strictNullChecks globally and removes it from individual packages that extend the global tsconfig.json file.

[codecov]

Codecov Report

All modified lines are covered by tests ✅

Comparison is base (595d818) 77.39% compared to head (6dde8d1) 77.39%.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #1126   +/-   ##
=======================================
  Coverage   77.39%   77.39%           
=======================================
  Files          80       80           
  Lines       16159    16159           
  Branches     1519     1519           
=======================================
  Hits        12506    12506           
  Misses       3632     3632           
  Partials       21       21           

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[danielpeintner]

As another step towards resolving #1046, this PR enables strictNullChecks globally and removes it from individual packages that extend the global tsconfig.json file.

I am just wondering: Why do you say "another step towards resolving"?
If I understand this PR properly it resolves the issue, am I wrong?

Unless there are "strictNullChecks": false left in some packages.

[JKRhb]

I think the linked issue is mostly about the @typescript-eslint/strict-boolean-expressions linting rule, for which strictNullChecks are a pre-condition – but I am currently preparing a PR to also resolve that part :)

[relu91]

Well done merging.