feat: add support for NR Control [wip]

[bduranleau-nr]

• Agent configuration
• Agent health file generation
• UUID generation
• Agent unit tests <-- in progress
• Agent health update logic
• Agent <-> Daemon communication
• Daemon health file management
• Daemon health update logic
• Daemon unit tests

[newrelic-php-agent-bot]

Test Suite	Status	Result
Multiverse	❌	6/8 passing
SOAK	✅	79/79 passing

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 80.88235% with 26 lines in your changes missing coverage. Please review.

Project coverage is 77.23%. Comparing base (8124792) to head (2114de5).
Report is 2 commits behind head on dev.

Files with missing lines	Patch %	Lines
axiom/util_health.c	83.14%	15 Missing ⚠️
agent/php_nrini.c	75.86%	7 Missing ⚠️
agent/php_minit.c	50.00%	4 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##              dev    #1043      +/-   ##
==========================================
- Coverage   77.87%   77.23%   -0.64%     
==========================================
  Files         198      200       +2     
  Lines       27899    28035     +136     
==========================================
- Hits        21727    21654      -73     
- Misses       6172     6381     +209     

Flag	Coverage Δ
agent-for-php-7.2	77.46% <80.88%> (-0.68%)	⬇️
agent-for-php-7.3	77.48% <80.88%> (-0.68%)	⬇️
agent-for-php-7.4	77.20% <80.88%> (-0.67%)	⬇️
agent-for-php-8.0	76.59% <80.88%> (-0.66%)	⬇️
agent-for-php-8.1	76.99% <80.88%> (-0.66%)	⬇️
agent-for-php-8.2	76.60% <80.88%> (-0.66%)	⬇️
agent-for-php-8.3	76.60% <80.88%> (-0.66%)	⬇️
agent-for-php-8.4	76.62% <80.88%> (-0.66%)	⬇️

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