[SDK] Create instrumentation scope library

[dbarker]

Contributes to #1429

This PR creates CMake and Bazel targets for the instrumentation scope library. This is an important target to provide as it supports users in linking to just what they need use the InstrumentationScope object in their projects (e.g. building custom configurators, etc.). Also supports moving SDK code out of headers and into .cc files (#1429).

With this change users can link directly to the library with:

   target_link_libraries(my_library PRIVATE opentelemetry-cpp::instrumentation_scope)

The library will also be a public transitive link provided by metrics, trace, and logs targets.

Changes

• moves instrumentation_scope.h impl to instrumentation_scope.cc and creates library targets with CMake and Bazel

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 82.63%. Comparing base (60c3d11) to head (a8ebe1f).

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #4351      +/-   ##
==========================================
+ Coverage   82.61%   82.63%   +0.02%     
==========================================
  Files         511      512       +1     
  Lines       20132    20140       +8     
==========================================
+ Hits        16631    16641      +10     
+ Misses       3501     3499       -2     

Files with missing lines	Coverage Δ
...y/sdk/instrumentationscope/instrumentation_scope.h	100.00% <ø> (ø)
.../src/instrumentationscope/instrumentation_scope.cc	100.00% <100.00%> (ø)

... and 1 file with indirect coverage changes

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[Copilot]

Pull request overview

This PR introduces a standalone SDK “instrumentation scope” library target (CMake + Bazel) and moves InstrumentationScope method implementations out of the public header into a compiled .cc, enabling consumers to link only what they need and supporting the ongoing effort to shift SDK implementation into source files.

Changes:

• Added new opentelemetry_instrumentation_scope CMake target and corresponding Bazel //sdk/src/instrumentationscope library.
• Moved InstrumentationScope implementation from instrumentation_scope.h into instrumentation_scope.cc.
• Made metrics/trace/logs targets depend transitively on the new instrumentation scope library and updated tests/build wiring accordingly.

Reviewed changes

Copilot reviewed 15 out of 15 changed files in this pull request and generated 1 comment.

Show a summary per file

File	Description
sdk/test/instrumentationscope/CMakeLists.txt	Switches the test executable to link against the new instrumentation scope library target.
sdk/test/instrumentationscope/BUILD	Adds Bazel deps so the instrumentation scope tests link against the new library (and related common code).
sdk/src/trace/CMakeLists.txt	Adds opentelemetry_instrumentation_scope as a PUBLIC dependency of the trace SDK library.
sdk/src/trace/BUILD	Adds Bazel dependency on //sdk/src/instrumentationscope for the trace SDK library.
sdk/src/metrics/CMakeLists.txt	Adds opentelemetry_instrumentation_scope as a PUBLIC dependency of the metrics SDK library.
sdk/src/metrics/BUILD	Adds Bazel dependency on //sdk/src/instrumentationscope for the metrics SDK library.
sdk/src/logs/CMakeLists.txt	Adds opentelemetry_instrumentation_scope as a PUBLIC dependency of the logs SDK library.
sdk/src/logs/BUILD	Adds Bazel dependency on //sdk/src/instrumentationscope for the logs SDK library.
sdk/src/instrumentationscope/instrumentation_scope.cc	New compiled implementation of InstrumentationScope APIs previously inline in the header.
sdk/src/instrumentationscope/CMakeLists.txt	New CMake target definition for opentelemetry_instrumentation_scope (with install/pkg-config support).
sdk/src/instrumentationscope/BUILD	New Bazel cc_library for the instrumentation scope implementation.
sdk/src/CMakeLists.txt	Adds the new instrumentationscope subdirectory to the SDK build.
sdk/include/opentelemetry/sdk/instrumentationscope/instrumentation_scope.h	Converts previously-inline methods to declarations only (implementation moved to .cc).
sdk/CMakeLists.txt	Registers the new SDK component so it’s exported/installed with other SDK libraries.
CHANGELOG.md	Adds a changelog entry for the new SDK instrumentation scope library target.

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