[NFC][analyzer] Simplify ownership of checker objects (#128887) Previously checker objects were created by raw `new` calls, which necessitated managing and calling their destructors explicitly. This commit refactors this convoluted logic by introducing `unique_ptr`s that to manage the ownership of these objects automatically. This change can be thought of as stand-alone code quality improvement; but I also have a secondary motivation that I'm planning further changes in the checker registration/initialization process (to formalize our tradition of multi-part checker) and this commit "prepares the ground" for those changes.
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