[FR]: Publish `hermetic_build.cmake`

[leha-bot]

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Does the feature exist in the most recent commit?

It seems to exist long time ago (from commit https://github.com/google/googletest/blob/c476707e82f8db4974912594fbf419326973cb2a/CMakeLists.txt )

Why do we need this feature?

It could improve all downstream distributions with ability to use hermetic builds with CMake and improves the reproducibility of all gtest builds

Describe the proposal.

There are a mystical cmake script for hermetic builds using cmake, but it is not exist in repo , but optionally include()-d.

Is the feature specific to an operating system, compiler, or build system version?

Specific to cmake build