add DMA by offset feature, SHM POSIX example, and support for args with benchmarking

[JacobBarthelmeh]

This PR adds support for SHM (Shared Memory) POSIX DMA transport to wolfHSM, enabling pass-by-reference communication between client and server through shared memory segments with optimized memory allocation.

Implements DMA transport layer with static memory management for improved performance
Adds client/server configuration infrastructure for multiple transport types (TCP, SHM, DMA)
Enhances POSIX examples to support configurable transport types with command-line options

[billphipps]

I like the refactoring to provide a single client/server example that has both transports included. We need to rework the config so there's a shared configuration header file that both the client and server apps can include. Need to split the wh_posix_*.c files into server and client versions (probably just move the contents back into their respective .c files). I'll chat with you about this.

[bigbrett]

@JacobBarthelmeh OK if we mark this as draft until it is ready for final review and CI is passing?

[Copilot]

Pull Request Overview

This PR adds support for SHM (Shared Memory) POSIX DMA transport to wolfHSM, enabling pass-by-reference communication between client and server through shared memory segments with optimized memory allocation.

• Implements DMA transport layer with static memory management for improved performance
• Adds client/server configuration infrastructure for multiple transport types (TCP, SHM, DMA)
• Enhances POSIX examples to support configurable transport types with command-line options

Reviewed Changes

Copilot reviewed 34 out of 36 changed files in this pull request and generated 8 comments.

Show a summary per file

File	Description
wolfhsm/wh_server.h	Adds IsDmaTransport function declaration
wolfhsm/wh_client.h	Adds DMA-related types, callbacks, and function declarations
src/wh_server.c	Implements DMA transport detection and auto-configuration
src/wh_client_dma.c	New file implementing DMA address processing and validation
src/wh_client_crypto.c	Updates SHA256 DMA function with proper address translation
src/wh_client.c	Adds DMA transport detection and auto-configuration
port/posix/posix_transport_dma.h	New header defining DMA transport interface
port/posix/posix_transport_dma.c	New implementation of DMA transport with static memory
examples/posix/	Updated POSIX examples with multi-transport support and configuration
benchmark/	Enhanced benchmark suite with transport type selection

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[Copilot]

Pull Request Overview

Copilot reviewed 39 out of 41 changed files in this pull request and generated 8 comments.

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[JacobBarthelmeh]

Run git-clang-format

[bigbrett]

@JacobBarthelmeh Great additions from a functionality standpoint!! I think from a layout/organization perspective there is still some work to be done. Here is a first round of review comments that I think should be addressed.

[billphipps]

Looks great! Thank you!