Added support for size() scalar function.

[tonioo]

Also generate unique variable names for nodes used in relation traversals.

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud

[codecov]

Codecov Report

Attention: Patch coverage is 96.00000% with 2 lines in your changes missing coverage. Please review.

Please upload report for BASE (rc/5.4.3@f6d87a9). Learn more about missing BASE report.

Files with missing lines	Patch %	Lines
neomodel/async_/match.py	96.00%	1 Missing ⚠️
neomodel/sync_/match.py	96.00%	1 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##             rc/5.4.3     #858   +/-   ##
===========================================
  Coverage            ?   92.21%           
===========================================
  Files               ?       35           
  Lines               ?     5663           
  Branches            ?        0           
===========================================
  Hits                ?     5222           
  Misses              ?      441           
  Partials            ?        0           

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