[WIP] Add a CPU runtime compilation step, that allows to fuse the ReadBack operations present in an std::vector<JIT_Operation_pp>

[Copilot]

• Analyzed repository structure and build system
• Confirmed project builds successfully with CMake
• Identified missing components: jit_operation_pp structure and LLVM integration
• Add LLVM ORC v2 dependency to CMake build system (cmake/libs/llvm.cmake)
• Create executor_details directory and cpu_jit_details.h file structure
• Define jit_operation_pp structure with opData (void*) and opType (string) fields
• Implement compile-time function to analyze opType strings and build runtime function (stub)
• Implement runtime-compiled function that casts void* to actual types and calls fuseBack (stub)
• Add fuseBack template function that handles ReadBack operation fusion logic (basic template)
• Create tests/JIT directory and test_cpu_jit.h with unit tests
• Basic tests pass without LLVM dependency
• Test with LLVM integration enabled
• Implement full runtime compilation workflow with LLVM ORCv2
• Ensure LLVM libraries are statically linked to resulting binaries
• Test complete runtime compilation workflow

Basic infrastructure is in place. The CPUJITCompiler class provides the interface for runtime compilation of ReadBack operations. Next step is to enable LLVM integration and implement the full compilation workflow.

Fixes #64.

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