C++ SDK sanity checks now header/source version against rerun_c binary version

[Wumpf]

What

• Fixes Sanity-check that the C header version and rerun_c library version is the same #3868
• Fixes left over to set generic package version from Support cmake install #4326
  • Yes there's two levels of regex'ing existing files now, but I'm happy with it because it avoids etching the version into more places: The repo cmake setup first figures out the rerun version by taking a look at Cargo.toml and puts that into rerun.h which we commit. Then when doing an install (in repo or outside!) we check rerun.h's version and put that into the CMake Install shenanigans

Tests erro'red correctly when I still had a longer string, looked like this:

-------------------------------------------------------------------------------
Scenario: RecordingStream can connect
      Given: a new RecordingStream
-------------------------------------------------------------------------------
/Users/andreas/dev/rerun-io/rerun/rerun_cpp/tests/recording_stream.cpp:433
...............................................................................

/Users/andreas/dev/rerun-io/rerun/rerun_cpp/tests/recording_stream.cpp:433: FAILED:
due to unexpected exception with message:
  Rerun_c SDK version and SDK header/source versions don't match match. Make
  sure to link against the correct version of the rerun_c library.
  Rerun_c version:
  re_sdk 0.11.0-alpha.1+dev [rustc 1.72.1 (d5c2e9c34 2023-09-13), LLVM 16.0.5]
  aarch64-apple-darwin
  SDK header/source version:
  0.11.0-alpha.1+dev

Checklist

• I have read and agree to Contributor Guide and the Code of Conduct
• I've included a screenshot or gif (if applicable)
• I have tested demo.rerun.io (if applicable)
• The PR title and labels are set such as to maximize their usefulness for the next release's CHANGELOG

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[emilk]

Very good!