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cmListFileCache: Make cmListFileFunction a shared pointer

Oleksandr Koval requested to merge OleksandrKvl/cmake:optimize-cmListFileFunction into master

This it the last part of !5178 (closed). The idea is to make cmListFileFunction a shared_ptr to eliminate relatively expensive and unnecessary copy operations in function blockers. Every time function blocker is executed it copies commands inside. This is only initial proposal, consider next changes to it:

  • keep cmListFileFunction untouched and replace all its usage with cmListFileFunctionPtr.
  • make it const: using cmListFileFunctionPtr = std::shared_ptr<const cmListFileFunction>;.

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