Update Svc::BufferManager data structures to align with allocation

[timcanham]

F´ Version	3.0.0
Affected Component	`Svc::BufferManager``

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Feature Description

Reorganize internal data structures to honor alignment.

Rationale

The data structures tracking memory buffers in Svc::BufferManager look like this:

        struct AllocatedBuffer
        {
            Fw::Buffer buff; //!< Buffer class to give to user
            U8 *memory;      //!< pointer to memory buffer
            U32 size;        //!< size of the buffer
            bool allocated;  //!< this buffer has been allocated
        };

The issue is that if a user wants to get aligned buffers, the memory member is not aligned.

The proposal would be to reorganize the data structures so that the memory pointers retain the alignment. This could be done by placing the AllocatedBuffer structs at the end of the overall allocated buffer.

[matt392code]

buffer-manager-2.txt
Propsed buffer alignment issue solution:
Key improvements in this design:

1. Alignment Guarantees

struct alignas(std::max_align_t) BufferMetadata { ... }

• Uses maximum platform alignment
• Ensures compatibility with hardware DMA
• Works with SIMD operations

2. Memory Layout

[Alignment Padding][User Buffer][Metadata]

• User buffer starts on alignment boundary
• Metadata stored at end to preserve alignment
• Efficient memory usage

3. Memory Management

• Clean allocation/deallocation
• No memory leaks
• Proper tracking of buffer status

4. Compatibility

• Works with existing Fw::Buffer interface
• Minimal changes to client code
• Platform independent