Add FrankenPHP to the list of recognised/supported SAPIs

[realFlowControl]

Description

PROF-9184 / #2070

This PR aimes to add support for FrankenPHP SAPI, now that ZTS support exists. In detail this means:

• adding FrankenPHP to the list of detected SAPIs
•  adding frankenphp_handle_request() (worker mode) to the idle times in timeline (analogue to rshutdown -> rinit in PHP-FPM)

Note: Screenshot is from the FrankenPHP Symfony Demo application in the reliability environment using worker mode

Reviewer checklist

• Test coverage seems ok.
• Appropriate labels assigned.

[pr-commenter]

Benchmarks

Benchmark execution time: 2024-03-01 10:55:50

Comparing candidate commit ac127a6 in PR branch florian/frankenphp with baseline commit 552b0ef in branch master.

Found 0 performance improvements and 1 performance regressions! Performance is the same for 181 metrics, 0 unstable metrics.

scenario:TraceSerializationBench/benchSerializeTrace

• 🟥 execution_time [+4.501µs; +8.399µs] or [+2.447%; +4.566%]

[bwoebi]

If we're going to support frankenphp in the profiler, the tracer probably should too.

I think it's not too different from other sapis, so probably the tracer should just support it out of the box once added to components/sapi/sapi.c and dd_is_compatible_sapi in ddtrace.c.

[codecov-commenter]

Codecov Report

Merging #2523 (60b8ded) into master (552b0ef) will increase coverage by 2.18%.
Report is 1 commits behind head on master.
The diff coverage is 100.00%.

Additional details and impacted files

@@             Coverage Diff              @@
##             master    #2523      +/-   ##
============================================
+ Coverage     76.55%   78.74%   +2.18%     
  Complexity      267      267              
============================================
  Files           138      112      -26     
  Lines         17457    13486    -3971     
  Branches        976        0     -976     
============================================
- Hits          13364    10619    -2745     
+ Misses         3573     2867     -706     
+ Partials        520        0     -520     

Flag	Coverage Δ
appsec-extension	?
tracer-extension	78.69% <100.00%> (+<0.01%)	⬆️
tracer-integrations	79.49% <ø> (ø)

Flags with carried forward coverage won't be shown. Click here to find out more.

Files	Coverage Δ
components/sapi/sapi.c	80.00% <ø> (ø)
ext/ddtrace.c	73.03% <100.00%> (+0.01%)	⬆️

... and 26 files with indirect coverage changes

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