Revert "Revert "Revert "[analyzer] NFC: Move path diagnostic consumer...

Revert "Revert "Revert "[analyzer] NFC: Move path diagnostic consumer implementations to libAnalysis."""

This reverts commit d2ddc694.

This still contains a circular dependency between Analysis and CrossTU:

$ grep -r include.*Analysis clang/include/clang/CrossTU
clang/include/clang/CrossTU/CrossTranslationUnit.h:
  #include "clang/Analysis/CrossTUAnalysisHelper.h"
$ grep -r include.*CrossTU clang/lib/Analysis
clang/lib/Analysis/PlistHTMLPathDiagnosticConsumer.cpp:
  #include "clang/CrossTU/CrossTranslationUnit.h"
clang/lib/Analysis/PlistPathDiagnosticConsumer.cpp:
  #include "clang/Analysis/CrossTUAnalysisHelper.h"