feat(core/webdaql): add is not null syntax

[abalam666]

Changes

please link the issues here

Changes proposed in this pull request

[codecov]

Codecov Report

Attention: Patch coverage is 61.90476% with 8 lines in your changes missing coverage. Please review.

Project coverage is 99.96%. Comparing base (eaa5fd4) to head (d6a9aaf).

Files with missing lines	Patch %	Lines
packages/core/src/stores/webdaql/query.ts	61.90%	8 Missing ⚠️

Additional details and impacted files

@@                 Coverage Diff                  @@
##           maintenance/v3.x     #737      +/-   ##
====================================================
- Coverage             99.98%   99.96%   -0.02%     
====================================================
  Files                   140      140              
  Lines                 43286    43306      +20     
  Branches               6456     6457       +1     
====================================================
+ Hits                  43278    43290      +12     
- Misses                    8       16       +8     

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