feat(agent): add config option to not instrument framework exception handlers

[ZNeumann]

Our instrumentation of framework exception handlers can result in excess, unwanted error events being generated. Sometimes, these events are plentiful and diverse enough that manual filtering through them with our other error related INI options is too much effort. In cases like that, this setting exists as an easy solution. Errors may still appear on spans, but error events will, in general, not be created. This works especially well when the customer inserts their own error handling logic into the stack, so that they are able to call our API for certain, specific errors that they wish to be error events.

[newrelic-php-agent-bot]

Test Suite	Status	Result
Multiverse	❌	8/16 passing
SOAK	❌	84/85 passing

[codecov-commenter]

Codecov Report

❌ Patch coverage is 52.63158% with 9 lines in your changes missing coverage. Please review.
✅ Project coverage is 78.11%. Comparing base (22d0138) to head (65ca8d5).
⚠️ Report is 6 commits behind head on dev.

Files with missing lines	Patch %	Lines
agent/fw_laravel.c	0.00%	6 Missing ⚠️
agent/fw_lumen.c	0.00%	3 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##              dev    #1113      +/-   ##
==========================================
- Coverage   78.11%   78.11%   -0.01%     
==========================================
  Files         193      193              
  Lines       27991    27997       +6     
==========================================
+ Hits        21866    21870       +4     
- Misses       6125     6127       +2     

Flag	Coverage Δ
agent-for-php-7.2	78.36% <55.55%> (-0.01%)	⬇️
agent-for-php-7.3	78.38% <55.55%> (-0.01%)	⬇️
agent-for-php-7.4	78.24% <55.55%> (-0.01%)	⬇️
agent-for-php-8.0	77.44% <50.00%> (-0.01%)	⬇️
agent-for-php-8.1	77.75% <50.00%> (-0.01%)	⬇️
agent-for-php-8.2	77.37% <50.00%> (-0.01%)	⬇️
agent-for-php-8.3	77.37% <50.00%> (-0.01%)	⬇️
agent-for-php-8.4	77.38% <50.00%> (-0.01%)	⬇️

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