Drop Configuration classes from API

[bwoebi]

Description

They're nowhere used internally (anymore). Avoid having multiple APIs: dd_trace_env_config() is enough.

Please consider whether this makes sense.

Reviewer checklist

• Test coverage seems ok.
• Appropriate labels assigned.

[pr-commenter]

Benchmarks

Benchmark execution time: 2024-03-27 12:17:31

Comparing candidate commit c0cda03 in PR branch bob/drop-api-config with baseline commit 530e4cd in branch ddtrace-1.0.0.

Found 0 performance improvements and 1 performance regressions! Performance is the same for 177 metrics, 0 unstable metrics.

scenario:TraceSerializationBench/benchSerializeTrace

• 🟥 execution_time [+11.093µs; +15.907µs] or [+3.258%; +4.672%]

[codecov-commenter]

Codecov Report

Merging #2596 (c0cda03) into ddtrace-1.0.0 (530e4cd) will increase coverage by 0.46%.
The diff coverage is n/a.

Additional details and impacted files

@@                 Coverage Diff                 @@
##             ddtrace-1.0.0    #2596      +/-   ##
===================================================
+ Coverage            77.51%   77.98%   +0.46%     
+ Complexity            2257     2181      -76     
===================================================
  Files                  227      224       -3     
  Lines                25840    25676     -164     
  Branches               976      976              
===================================================
- Hits                 20030    20023       -7     
+ Misses                5290     5133     -157     
  Partials               520      520              

Flag	Coverage Δ
appsec-extension	69.13% <ø> (ø)
tracer-extension	78.46% <ø> (ø)
tracer-php	81.23% <ø> (+1.39%)	⬆️

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Files	Coverage Δ
src/api/Data/Span.php	65.00% <ø> (ø)

... and 1 file with indirect coverage changes

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[PROFeNoM]

These removals look good to be as seemingly not used internally and not customer-facing.

FYI, this test is failing - I don't think it's related with this PR though (or maybe a re-run is enough, idk).