Enable compile/link time profiling

[greenc-FNAL]

No description provided.

[greenc-FNAL]

@phlexbot cmake-fix

[github-actions]

Automatic cmake-format fixes pushed (commit c2b60b7).
⚠️ Note: Some issues may require manual review and fixing.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.

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  Coverage   83.71%   83.71%           
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  Lines        3291     3291           
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  Hits         2755     2755           
  Misses        325      325           
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Flag	Coverage Δ
unittests	83.71% <ø> (ø)

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[Copilot]

Pull request overview

Adds an opt-in CMake configuration to profile build-time behavior (compile and link), helping developers identify expensive translation units and link steps during Phlex builds.

Changes:

• Introduces ENABLE_BUILD_PROFILING CMake option to wrap compile/link rules with cmake -E time.
• Enables compile time tracing (-ftime-trace) for Clang/GNU toolchains when profiling is enabled.
• Enables additional LLD link tracing/statistics flags when LLD is detected.

[Copilot]

-Wl,--Map=phlex_link.map is added globally when build profiling is enabled. Since this project links multiple shared libraries/modules/executables in parallel, all link steps will try to write the same map file in the build directory, leading to races/overwrites (and potentially interleaved/corrupt output under parallel builds). Consider removing the global map generation, or emitting a per-target map file (e.g., via target-specific link options or a small helper that sets a unique map path per target).

Suggested change

add_link_options("-Wl,--Map=phlex_link.map")