Refactor span_event & cache spans in compact mode

[hmstepanek]

Overview

• Refactor span_event function for the different modes into separate functions to improve readability and reduce complexity.
• Cache spans before adding to reservoir in compact mode.

[github-actions]

✅MegaLinter analysis: Success

Descriptor	Linter	Files	Fixed	Errors	Warnings	Elapsed time
✅ ACTION	actionlint	7		0	0	0.84s
✅ MARKDOWN	markdownlint	7	0	0	0	0.99s
✅ PYTHON	ruff	972	0	0	0	0.97s
✅ PYTHON	ruff-format	972	0	0	0	0.34s
✅ YAML	prettier	15	0	0	0	1.44s
✅ YAML	v8r	15		0	0	5.55s
✅ YAML	yamllint	15		0	0	0.6s

See detailed reports in MegaLinter artifacts

[codecov-commenter]

Codecov Report

❌ Patch coverage is 93.93939% with 6 lines in your changes missing coverage. Please review.
⚠️ Please upload report for BASE (develop-hybrid-core-tracing@0c05c66). Learn more about missing BASE report.

Files with missing lines	Patch %	Lines
newrelic/core/node_mixin.py	93.68%	2 Missing and 4 partials ⚠️

Additional details and impacted files

@@                      Coverage Diff                       @@
##             develop-hybrid-core-tracing    #1615   +/-   ##
==============================================================
  Coverage                               ?   79.93%           
==============================================================
  Files                                  ?      213           
  Lines                                  ?    25168           
  Branches                               ?     4001           
==============================================================
  Hits                                   ?    20117           
  Misses                                 ?     3622           
  Partials                               ?     1429           

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