Change wrap object size argument to be in/out instead of in

[AlexLanzano]

Implements #196

[Copilot]

Pull Request Overview

This PR implements issue #196 by changing wrap/unwrap function size arguments from input-only to input/output parameters. This allows callers to provide a buffer size and receive back the actual size of the wrapped/unwrapped object, which may be smaller than the buffer.

Key changes:

• Function signatures updated to use pointer parameters for size arguments (e.g., uint16_t wrappedKeySz → uint16_t* wrappedKeySz)
• Constants renamed from WOLFHSM_KEYWRAP_* to WH_KEYWRAP_* prefix for consistency
• New WH_KEYWRAP_AES_GCM_HEADER_SIZE constant added to simplify size calculations

Reviewed Changes

Copilot reviewed 8 out of 8 changed files in this pull request and generated 3 comments.

Show a summary per file

File	Description
wolfhsm/wh_common.h	Renamed constants to use WH_ prefix and added new header size constant
wolfhsm/wh_client.h	Updated function signatures and documentation for in/out size parameters
src/wh_client_keywrap.c	Implemented pointer-based size handling with buffer overflow checks and actual size returns
src/wh_server_keystore.c	Updated to use renamed constants and improved validation logic for wrapped key metadata
test/wh_test_multiclient.c	Updated test calls to pass size variables by reference
test/wh_test_keywrap.c	Updated test code to use new API signatures and renamed constants
test/wh_test_crypto.c	Updated usage policy test to pass size by reference
examples/demo/client/wh_demo_client_keywrap.c	Updated demo to use new pointer-based size parameters

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[bigbrett]

@AlexLanzano also need to fix CI