fix(agent): add missing includes

[ZNeumann]

No description provided.

[newrelic-php-agent-bot]

Test Suite	Status	Result
Multiverse	❌	7/8 passing
SOAK	❌	75/79 passing

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 77.87%. Comparing base (11a026f) to head (930114c).
Report is 2 commits behind head on dev.

Additional details and impacted files

@@           Coverage Diff           @@
##              dev    #1036   +/-   ##
=======================================
  Coverage   77.87%   77.87%           
=======================================
  Files         198      198           
  Lines       27899    27899           
=======================================
  Hits        21727    21727           
  Misses       6172     6172           

Flag	Coverage Δ
agent-for-php-7.2	78.13% <ø> (ø)
agent-for-php-7.3	78.15% <ø> (ø)
agent-for-php-7.4	77.86% <ø> (ø)
agent-for-php-8.0	77.25% <ø> (ø)
agent-for-php-8.1	77.65% <ø> (ø)
agent-for-php-8.2	77.26% <ø> (ø)
agent-for-php-8.3	77.26% <ø> (ø)
agent-for-php-8.4	77.27% <ø> (ø)

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