Soft Disable AES-CBC

[ejohnstown]

1. By default, soft disable AES-CBC. It isn't offered as a default encrypt algorithm, but may be set at runtime.
2. Add guard where AES-CBC can be added back as a default.
3. Add option to example client to run it with a custom encrypt algorithm list.
4. In the client, add macro to add items to the arg lists while checking the number of items in the list.
   (ZD 19606)

[Copilot]

Pull Request Overview

This PR implements a soft-disable mechanism for AES-CBC by introducing a new preprocessor flag and updates the test and client example code to reflect configurable encryption settings.

• Introduces new macros for adding string and integer arguments in kex tests
• Adds the WOLFSSH_NO_AES_CBC_SOFT_DISABLE flag and integrates it in the advertised cipher list
• Updates the example client to accept a custom cipher list via command-line arguments

Reviewed Changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated 2 comments.

File	Description
tests/kex.c	Refactors argument addition using new ADD_ARG macros; expands client and server argument arrays to support additional options
src/internal.c	Adds new soft disable flag for AES-CBC and adjusts advertised cipher list accordingly
examples/client/client.c	Adds command-line support to specify a custom encryption algorithm list

[Copilot]

Pull Request Overview

This PR soft disables AES-CBC by default while allowing its re-enablement through a runtime flag, and it adds new macros to safely build command-line argument lists for testing and client usage. Key changes include:

• Introduction of the ADD_ARG and ADD_ARG_INT macros in tests/kex.c to build argument lists.
• Addition of the WOLFSSH_NO_AES_CBC_SOFT_DISABLE flag and update to the encryption algorithm list in src/internal.c.
• Updates to the client usage message and argument parsing in examples/client/client.c.

Reviewed Changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated 2 comments.

File	Description
tests/kex.c	Added macros for argument list management and updated argument-building calls for server and client configurations.
src/internal.c	Introduced WOLFSSH_NO_AES_CBC_SOFT_DISABLE and modified the encryption algorithm list condition.
examples/client/client.c	Updated help text and command-line parsing to support a custom cipher list.

[douzzer]

This PR appears to be unmergeable due to a bug in githib (see https://github.com/orgs/community/discussions/144455)

A trick that often works is to close and reopen a PR. I've used that to clear a rebase conflict (the instant-dismissed-review syndrome). Doesn't work here.

[LinuxJedi]

No problem merging for me, once I resolved the open conversation I could see.

[douzzer]

Thanks @LinuxJedi -- not sure if I was missing something or if something changed, but all's well that ends well.