Support LLVM 19 and ROCm 6.4.x

[ggeorgakoudis]

• Guard parallel split codegen for LLVM 18 because it requires an interface exported only in that version
• Update lambda handling as LLVM 19 can generate offsets on a byte pointer to access the lambda class fields
• Other small code fixes for compatibility with LLVM 19
• Add testing for LLVM 19 and ROCm 6.4.1

[github-actions]

Cpp-Linter Report ⚠️

Some files did not pass the configured checks!

clang-tidy (v18.1.3) reports: 2 concern(s)

• include/proteus/CoreLLVMHIP.hpp:28:10: error: [clang-diagnostic-error]

  'lld/Common/Driver.h' file not found

     28 | #include <lld/Common/Driver.h>
        |          ^~~~~~~~~~~~~~~~~~~~~

• include/proteus/Error.h:4:1: warning: [llvm-include-order]

  #includes are not sorted properly

      4 | #include <cstdint>
        | ^        ~~~~~~~~~
        |          <llvm/ADT/Twine.h>
      5 | #include <llvm/ADT/Twine.h>
        |          ~~~~~~~~~~~~~~~~~~
        |          <cstdint>

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