* Update optional-lite and span-lite to use CMakePackage
These packages only have CMake installs on their most recent versions.
Therefore, we overload all of the CMake stages to fallback to the old
versions (no-op for most, copytree for install), and use CMakePackage on
the new versions.
* Add new string-view-lite version with CMake install support
* Only override phases for old versions of *-lite packages
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