Dual-Stack Endpoints Support

[stefankiesz]

Issue #, if available: N/A

What was changed?

• Added support for sample applications to be able to specify to use dual-stack endpoints for KVS.
  • This will allow applications to opt-in to using dual-stack (IPv4 & IPv6-supported) endpoints while leaving the legacy (IPv4-only) endpoints to be the default mode.
• The Common.c sample file now demonstrates how to generate a dual-stack Control Plane endpoint based on the configured region.
• Gathered the createSampleConfiguration function's parameters, including the new useDualStackEndpoints parameter, into a single struct to avoid excessively long function signature.

[!NOTE] The name for this new useDualStackEndpoints parameter is plural because using the dual-stack Control Plane endpoint (once it is ready) will result in a dual-stack signaling channel server endpoint which will result in dual-stack TURN server URIs. It also will likely control legacy/dual-stack of the KVS STUN server endpoint that is also constructed in the application.

Why was it changed?

• For testing and demonstrating dual-stack endpoints.

How was it changed?

• By adding the relevant parameter and moving MAX_CONTROL_PLANE_URI_CHAR_LEN into a public header file for the application to access it.

What testing was done for the changes?

• Added unit tests to ensure that passed-in custom endpoints get set when constructing and validating ClientInfo object.
• Will add CI tests configured to use the dual-stack endpoints once they are ready.
• These code changes only work with public endpoints; have not tested with the public endpoints yet because they are not yet ready.

By submitting this pull request, I confirm that you can use, modify, copy, and redistribute this contribution, under the terms of your choice.

[stefankiesz]

[!IMPORTANT] Remember to revert Producer C SDK tag before merging!

[github-actions[bot]]

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