Change wrapped key size argument in wh_Client_KeyWrap to be in/out

[AlexLanzano]

Right now the wh_Client_KeyWrap function takes in an input argument for the wrapped key size. This is problematic because it requires the client to know exactly how long the wrapped key is but this expected size could vary depending on server configuration.

The fix:

• Change the wrapped key size argument from an input to an input/output
• Update the key wrap request/response to account for the new input/output wrapped key size parameter
• Update any tests/demos to this API change

[AlexLanzano]

Also, included in the fix for this is to create a common macro for the "header" size for AES GCM wrapped keys/data. right now the client has to manually add WOLFHSM_KEYWRAP_AES_GCM_IV_SIZE and WOLFHSM_KEYWRAP_AES_GCM_TAG_SIZE together which is a bit verbose

[bigbrett]

@AlexLanzano we should get this in sooner rather than later IMO