feat: Removed children from segments.

[bizob2828]

Description

This removes storing a segments children on the segment itself. Instead I've introduced a segments property on the transaction trace and added parentId to every segment. This will build the tree of segments when we serialize the trace but also get the children of a segment when we calculate the exclusive time. I'd like to improve the code in a follow up to only generate the tree for a segment once which will introduce some sort of linked list. I also want to remove storing the root segment on every segment and instead store this in the context manager

Related Issues

Closes #2657

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 97.31%. Comparing base (27d8484) to head (3fe4345).
Report is 1 commits behind head on next.

Additional details and impacted files

@@             Coverage Diff             @@
##             next    #2689       +/-   ##
===========================================
+ Coverage   79.12%   97.31%   +18.18%     
===========================================
  Files         281      291       +10     
  Lines       45230    46309     +1079     
===========================================
+ Hits        35790    45065     +9275     
+ Misses       9440     1244     -8196     

Flag	Coverage Δ
integration-tests-cjs-18.x	74.24% <96.05%> (?)
integration-tests-cjs-20.x	74.25% <96.05%> (?)
integration-tests-cjs-22.x	74.28% <96.05%> (?)
integration-tests-esm-18.x	49.83% <37.50%> (?)
integration-tests-esm-20.x	49.84% <37.50%> (?)
integration-tests-esm-22.x	49.86% <37.50%> (?)
unit-tests-18.x	88.91% <99.34%> (?)
unit-tests-20.x	88.91% <99.34%> (?)
unit-tests-22.x	88.92% <99.34%> (?)
versioned-tests-18.x	79.10% <94.07%> (+0.01%)	⬆️
versioned-tests-20.x	79.11% <94.07%> (+0.01%)	⬆️
versioned-tests-22.x	79.11% <94.07%> (-0.01%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

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