[clang] [Clang][UnsafeBufferUsage] Warn about two-arg string_view constructors. (PR #180471)

[Prajwal P J via cfe-commits]

pjalwadi wrote:

Thank you for the detailed feedback. I have refactored the code to introduce a dedicated StringViewTwoParamConstructorGadget and ensure the warning messages are specific to the type being used. The tests have also been updated and verified. Let me know if there is anything else!

https://github.com/llvm/llvm-project/pull/180471