refactor(agent): expose trace id and span id with app metadata

[anmol-ap]

Along with other app metadata, expose trace id and span id as well

[newrelic-php-agent-bot]

Test Suite	Status	Result
Multiverse	❌	2/9 passing
SOAK	❌	54/56 passing

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 0% with 15 lines in your changes missing coverage. Please review.

Project coverage is 78.63%. Comparing base (1a4bc74) to head (fc58607).

Files	Patch %	Lines
agent/csec_metadata.c	0.00%	15 Missing ⚠️

Additional details and impacted files

@@                         Coverage Diff                         @@
##           refactor/security-agent-support     #933      +/-   ##
===================================================================
- Coverage                            78.67%   78.63%   -0.04%     
===================================================================
  Files                                  194      194              
  Lines                                27285    27297      +12     
===================================================================
  Hits                                 21466    21466              
- Misses                                5819     5831      +12     

Flag	Coverage Δ
agent-for-php-7.0	77.40% <0.00%> (-0.03%)	⬇️
agent-for-php-7.1	77.11% <0.00%> (-0.04%)	⬇️
agent-for-php-7.2	78.04% <0.00%> (-0.04%)	⬇️
agent-for-php-7.3	78.06% <0.00%> (-0.04%)	⬇️
agent-for-php-7.4	77.76% <0.00%> (-0.04%)	⬇️
agent-for-php-8.0	77.83% <0.00%> (-0.04%)	⬇️
agent-for-php-8.1	77.81% <0.00%> (-0.04%)	⬇️
agent-for-php-8.2	77.41% <0.00%> (-0.04%)	⬇️
agent-for-php-8.3	77.41% <0.00%> (?)

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[ZNeumann]

The span id will be different depending on which agent's instrumentation is called first with OAPI