feat(profiling) add uptime information to profiles

[realFlowControl]

Description

This PR will add the info.json with only the start_time in RFC3339 format

{
    "application": {
        "start_time": "2024-12-31T23:59:59Z"
    }
}

In the profile view this will look like this:

The web-ui will magically calculate the uptime and show at the top and besides the time stamp. Next step is that we can create a metric out of this once we have this released

The feature used here was introduced in libdatadog with DataDog/libdatadog#289

Reviewer checklist

• Test coverage seems ok.
• Appropriate labels assigned.

[codecov-commenter]

Codecov Report

Merging #2610 (099d984) into master (6d15aec) will decrease coverage by 0.41%.
The diff coverage is n/a.

Additional details and impacted files

@@             Coverage Diff              @@
##             master    #2610      +/-   ##
============================================
- Coverage     77.76%   77.35%   -0.41%     
  Complexity     2198     2198              
============================================
  Files           225      199      -26     
  Lines         25959    21959    -4000     
  Branches        986        0     -986     
============================================
- Hits          20186    16986    -3200     
+ Misses         5247     4973     -274     
+ Partials        526        0     -526     

Flag	Coverage Δ
appsec-extension	?
tracer-extension	78.49% <ø> (ø)
tracer-php	75.73% <ø> (-4.84%)	⬇️

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see 30 files with indirect coverage changes

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[pr-commenter]

Benchmarks

Benchmark execution time: 2024-04-24 07:34:50

Comparing candidate commit 099d984 in PR branch florian/start-time with baseline commit 6d15aec in branch master.

Found 0 performance improvements and 0 performance regressions! Performance is the same for 27 metrics, 9 unstable metrics.