[CONFIGURATION] Cleanup build targets and docs

[dbarker]

Contributes to #4352

This PR is needed to maintain the CMake and Bazel target link interface for the declarative configuration component.

It implements the configuration build target cleanup proposed in #4352 (comment)

configuration                            (Interface to all configuration targets)
├── configuration_core                   (model, builder interfaces, registry, SdkBuilder, ConfiguredSdk)
├── configuration_yaml                   (yaml parser)
│   ├── PUBLIC  configuration_core
│   └── PRIVATE ryml::ryml
├── configuration_trace_builders         (default trace SDK builders)
│   ├── PUBLIC  opentelemetry_trace      
│   └── PUBLIC configuration_core
├── configuration_metrics_builders       (default metrics SDK builders)
│   ├── PUBLIC  opentelemetry_metrics    
│   └── PUBLIC configuration_core
├── configuration_logs_builders          (default logs SDK builders)
│   ├── PUBLIC  opentelemetry_logs      
│   └── PUBLIC configuration_core
└── configuration_registry_factory       (Create a Registry with all default builders )
    ├── PUBLIC  configuration_core
    ├── PRIVATE  configuration_trace_builders
    ├── PRIVATE  configuration_metrics_builders
    └── PRIVATE  configuration_logs_builders

Changes

• adds the configuration_yaml target and promotes the configuration target to be an interface to all config targets. This change is necessary to keep backwards compatibility with the 1.28 release. Users linking to opentelemetry-cpp::configuration will get all configuration targets needed to parse yaml and build an SDK.
• Cleans up the example to only link to the configuration interface target
• Installs each target's pkgconfig file and verifies it in CI
• Updates install tests and documentation.

Please provide a brief description of the changes here.

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

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 83.24%. Comparing base (ed49dd3) to head (289310d).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #4486      +/-   ##
==========================================
- Coverage   83.25%   83.24%   -0.00%     
==========================================
  Files         521      521              
  Lines       20381    20381              
==========================================
- Hits        16966    16964       -2     
- Misses       3415     3417       +2     

see 1 file with indirect coverage changes

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[marcalff]

LGTM