[SDK] File configuration: declarative resource detection types

[thc1006]

Fixes #3916.

Adds the declarative configuration model classes for resource detection per the
file configuration spec, so that the detection/development block under
resource parses into typed configs the SDK can dispatch on. SDK wiring
to actual ResourceDetector implementations is out of scope here and stays
behind the existing resource detectors not supported warning (#3548).

What changed

New header files under sdk/include/opentelemetry/sdk/configuration/:

• resource_detector_configuration.h — abstract base with
  Accept(visitor) const = 0
• resource_detector_configuration_visitor.h — visitor with one
  Visit* per leaf type (Container/Host/Process/Service/Extension)
• container_resource_detector_configuration.h
• host_resource_detector_configuration.h
• process_resource_detector_configuration.h
• service_resource_detector_configuration.h
• extension_resource_detector_configuration.h — fallback for
  non-standard detector names, follows the existing
  ExtensionSamplerConfiguration pattern (stores name, raw DocumentNode,
  depth)
• resource_detection_configuration.h — wraps optional
  IncludeExcludeConfiguration attributes plus a vector of detector configs

ResourceConfiguration: field renamed from detectors (old shape:
IncludeExclude of detector name strings) to detection
(std::unique_ptr<ResourceDetectionConfiguration>) so the model
matches the spec.

ConfigurationParser: parser methods for each new type. The detector
dispatcher reads the single map key per list entry (e.g. - container:) and
falls through to the Extension parser for any other name. The top-level
parser now looks up detection/development instead of detectors.

SdkBuilder: updated reference to the renamed field; existing warning
preserved.

Tests

sdk/test/configuration/yaml_resource_test.cc rewritten for the new shape
(17 cases total, all green). Type discrimination uses a TestDetectorVisitor
that implements the visitor interface, so the suite compiles under
-fno-rtti (Bazel nortti CI).

• empty resource / empty attributes / attributes list / both
• empty detection/development: block
• detection with attributes (included + excluded)
• each of container / host / process / service alone
• multiple detectors in one list
• extension detector with an arbitrary name
• combined attributes + detectors

The 5 old tests parsing the deprecated detectors.included/excluded shape
were removed (no longer matches the spec and the field no longer exists).

Verification

Built with WITH_CONFIGURATION=ON (Release, Ninja). All three YAML test
binaries pass with no regressions:

• yaml_test: 50/50
• yaml_resource_test: 17/17
• yaml_propagator_test: 9/9

Also built with -DCMAKE_CXX_FLAGS=-fno-rtti (reproducing the Bazel
nortti CI environment): yaml_resource_test 17/17.

End-to-end load of examples/configuration/kitchen-sink.yaml via
example_yaml --yaml ... --test reports MODEL PARSED, confirming the
full spec-shaped block (detection/development with nested attributes
and all 4 standard detectors) parses without error.

[codecov]

Codecov Report

❌ Patch coverage is 92.85714% with 5 lines in your changes missing coverage. Please review.
✅ Project coverage is 82.83%. Comparing base (e988943) to head (a8cecf9).

Files with missing lines	Patch %	Lines
sdk/src/configuration/configuration_parser.cc	91.08%	5 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #4148      +/-   ##
==========================================
+ Coverage   82.80%   82.83%   +0.04%     
==========================================
  Files         399      406       +7     
  Lines       16845    16913      +68     
==========================================
+ Hits        13946    14009      +63     
- Misses       2899     2904       +5     

Files with missing lines	Coverage Δ
...ration/container_resource_detector_configuration.h	100.00% <100.00%> (ø)
...ration/extension_resource_detector_configuration.h	100.00% <100.00%> (ø)
...nfiguration/host_resource_detector_configuration.h	100.00% <100.00%> (ø)
...guration/process_resource_detector_configuration.h	100.00% <100.00%> (ø)
...dk/configuration/resource_detector_configuration.h	100.00% <100.00%> (ø)
...guration/resource_detector_configuration_visitor.h	100.00% <100.00%> (ø)
...guration/service_resource_detector_configuration.h	100.00% <100.00%> (ø)
sdk/src/configuration/configuration_parser.cc	77.57% <91.08%> (+0.54%)	⬆️

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[marcalff]

Thanks for the PR.

There are multiple competing PRs to implement this, so seeing duplicate efforts is a bit sad.

Still, this PR is the most convincing, and the most complete.

Please see renaming comments, and make sure CI is clean.

It should be ready to merge after the cleanup.

[marcalff]

LGTM, thanks for the contribution.