feat(agent): update default for wp hooks options

[lavarou]

By default the agent will only instrument hook callbacks from plugins/themes and will not instrument hook callbacks from wordpress core.

[newrelic-php-agent-bot]

Test Suite	Status	Result
Multiverse	✅	9/9 passing
SOAK	✅	56/56 passing

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 78.70%. Comparing base (5b964b4) to head (e0ff77b).

Additional details and impacted files

@@           Coverage Diff           @@
##              dev     #880   +/-   ##
=======================================
  Coverage   78.70%   78.70%           
=======================================
  Files         193      193           
  Lines       27204    27204           
=======================================
  Hits        21410    21410           
  Misses       5794     5794           

Flag	Coverage Δ
agent-for-php-7.0	77.43% <ø> (ø)
agent-for-php-7.1	77.19% <ø> (ø)
agent-for-php-7.2	78.11% <ø> (ø)
agent-for-php-7.3	78.13% <ø> (ø)
agent-for-php-7.4	77.84% <ø> (ø)
agent-for-php-8.0	77.90% <ø> (ø)
agent-for-php-8.1	77.89% <ø> (ø)
agent-for-php-8.2	77.49% <ø> (ø)
agent-for-php-8.3	77.49% <ø> (ø)

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