Various improvements about subqueries.

[tonioo]

This PR brings the following changes:

• Fix an issue where subquery params were not injected into the final cypher query
• Better way to specify subquery initial context (variables)
• Use of "self" keyword within a NodeNameResolver call to reference top-level node

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 92.75%. Comparing base (4941d1d) to head (6c8a1f1).
Report is 6 commits behind head on rc/5.4.2.

Additional details and impacted files

@@             Coverage Diff              @@
##           rc/5.4.2     #845      +/-   ##
============================================
+ Coverage     92.66%   92.75%   +0.08%     
============================================
  Files            35       35              
  Lines          5401     5438      +37     
============================================
+ Hits           5005     5044      +39     
+ Misses          396      394       -2     

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

[sonarqubecloud]

Quality Gate passed

Issues
4 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