feat: Added segment synthesis for internal spans

[bizob2828]

Description

This one is straightforward, pull the name of span to name segment but prefix with Custom/

Related Issues

Closes #2652

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 88.78%. Comparing base (483cafe) to head (af42866).
Report is 1 commits behind head on next.

❗ There is a different number of reports uploaded between BASE (483cafe) and HEAD (af42866). Click for more details.

HEAD has 4 uploads less than BASE

Flag	BASE (483cafe)	HEAD (af42866)
unit-tests-22.x	1	0
unit-tests-20.x	1	0
unit-tests-18.x	1	0
integration-tests-cjs-22.x	1	0

Additional details and impacted files

@@            Coverage Diff             @@
##             next    #2840      +/-   ##
==========================================
- Coverage   97.36%   88.78%   -8.58%     
==========================================
  Files         304      296       -8     
  Lines       47194    46693     -501     
==========================================
- Hits        45949    41457    -4492     
- Misses       1245     5236    +3991     

Flag	Coverage Δ
integration-tests-cjs-18.x	73.21% <ø> (ø)
integration-tests-cjs-20.x	73.22% <ø> (+<0.01%)	⬆️
integration-tests-cjs-22.x	?
integration-tests-esm-18.x	49.87% <ø> (ø)
integration-tests-esm-20.x	49.87% <ø> (ø)
integration-tests-esm-22.x	49.92% <ø> (ø)
unit-tests-18.x	?
unit-tests-20.x	?
unit-tests-22.x	?
versioned-tests-18.x	79.15% <ø> (ø)
versioned-tests-20.x	79.16% <ø> (ø)
versioned-tests-22.x	79.16% <ø> (ø)

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