[CONFIGURATION] SDK default component builder libraries and example

[dbarker]

Contributes to #4352

Create configuration builder libraries per signal and update SdkBuilder to use them.

This brings a breaking change to how users create a default registry populated with SDK component builders.

// before this PR
auto registry = std::make_shared<sdk::configuration::Registry>();

// with this PR
auto registry = sdk::configuration::RegistryFactory::Create();

Changes

• creates the per-signal builder libraries
  • opentelemetry-cpp::configuration_logs_builders (9846e83)
  • opentelemetry-cpp::configuration_metrics_builders (f3328f3)
  • opentelemetry-cpp::configuration_trace_builders (7977068)
• creates the registry factory to create a fully populated registry with the default builders
  • openetelemetry-cpp::configuration_registry_factory (d077f5f)
• updates the SdkBuilder to get the new builders from the registry (3c1ba5a)
• enables the batch processor tests in the programmatic configuration test suite (a3442f3)
• updates the sdk and configuration component install tests (d4c7101)
• adds new yaml example (sdk-default.yaml) and test for builds without exporters (69b55ec, 3d02037)
• Adds a CompositeSampler to the model and breaks out composable samplers from the SamplerConfigurationVisttor

For significant contributions please make sure you have completed the following items:

• CHANGELOG.md updated for non-trivial changes
• Unit tests have been added
• Changes in public API reviewed

[codecov]

Codecov Report

❌ Patch coverage is 72.64151% with 116 lines in your changes missing coverage. Please review.
✅ Project coverage is 82.18%. Comparing base (768d04d) to head (ebe7b08).

Files with missing lines	Patch %	Lines
sdk/src/configuration/logs_builders.cc	44.71%	47 Missing ⚠️
sdk/src/configuration/sdk_builder.cc	73.30%	47 Missing ⚠️
sdk/src/configuration/trace_builders.cc	86.09%	16 Missing ⚠️
sdk/src/configuration/metrics_builders.cc	76.20%	5 Missing ⚠️
sdk/src/configuration/registry_factory.cc	85.72%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #4367      +/-   ##
==========================================
+ Coverage   82.11%   82.18%   +0.07%     
==========================================
  Files         494      501       +7     
  Lines       19670    19847     +177     
==========================================
+ Hits        16151    16310     +159     
- Misses       3519     3537      +18     

Files with missing lines	Coverage Δ
...tion/composable_always_off_sampler_configuration.h	100.00% <ø> (ø)
...ation/composable_always_on_sampler_configuration.h	100.00% <ø> (ø)
...omposable_parent_threshold_sampler_configuration.h	100.00% <ø> (ø)
...ion/composable_probability_sampler_configuration.h	100.00% <ø> (ø)
...figuration/composable_rule_based_sampler_builder.h	100.00% <ø> (ø)
...tion/composable_rule_based_sampler_configuration.h	100.00% <ø> (ø)
...k/configuration/composable_sampler_configuration.h	100.00% <100.00%> (ø)
...uration/composable_sampler_configuration_visitor.h	100.00% <100.00%> (ø)
...etry/sdk/configuration/composite_sampler_builder.h	100.00% <100.00%> (ø)
...dk/configuration/composite_sampler_configuration.h	100.00% <100.00%> (ø)
... and 15 more

... and 6 files with indirect coverage changes

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• ❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.

[dbarker]

The example is now tested here against three different yaml files covering all the default builders, extension builders, and composite sampler. These tests now fail on non-zero returns (thanks to the --test arg) or if the example logs an error.

[dbarker]

For smooth integration - this PR depends on several others and review/merge of these should be completed first:

1. [SDK] make global log level atomic #4368
2. [CONFIGURATION] validate and update config files to yaml schema 1.1.0 #4374
3. [CONFIGURATION] Build composable samplers from file configuration #4366

[dbarker]

The DLL build is not supported or tested for OTLP or Configuration classes (most are missing the required exports). Removing this to make the example easier to understand by moving the important config targets to the top of the file.

[marcalff]

nit: a Create() method should return a unique_ptr, not a shared_ptr. It is then to the caller to assign this unique_ptr to a shared_ptr if it wants it shared.

[dbarker]

Thanks I'll follow up with this one separately. It will impact all the call sites to the SdkBuilder and ConfiguredSdk::Create.

[marcalff]

Excellent work.

See minor nit, ok to merge.