Add dynamic permissions example

[colmenero]

Summary

Add an example that showcases dynamic permissions. This example is based on the one that codegen generates, with small modifications. First, the QoS configures security. Then, the publisher examples updates a QoS property (the Permissions Docuemnt) after some samples.

Details and comments

This PR also:

• Includes a CMake script to be able to generate a Permissions Document that expires in 1 minute.
• Modifies ConnextDdsGenerateSecurityArtifacts.cmake to work with OpenSSL 3. The new version requires configuring the CA certificate as a CA (CA_EXTENSION v3_ca).
• Add the enable_key_revision to the general Governance Document.

Checks

• I have updated the documentation accordingly.
• I have read the CONTRIBUTING document.
• I have added a new C/C++ example and updated examples/connext_dds/CMakeList.txt accordingly.
  • See here.

[Copilot]

Pull Request Overview

This PR adds a dynamic permissions example that demonstrates how to update a Permissions Document after it expires, modifying both security configuration files and build scripts. Key changes include:

• Updating the Governance XML schema and adding key revision support.
• Modifying CMake modules to work with OpenSSL 3, including certificate configuration changes.
• Adding a new C++11 dynamic permissions example (publisher and subscriber) along with supporting IDL and application files.

Reviewed Changes

Copilot reviewed 12 out of 12 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
resources/security/xml/Governance.xml	Updates schema version and enables key revision.
resources/cmake/Modules/ConnextDdsGenerateSecurityArtifacts.cmake	Adjusts file path usage and adds CA_EXTENSION configuration.
examples/connext_secure/dynamic_permissions/c++11/modify_permissions.cmake	Introduces a script to update the permissions file timestamp.
examples/connext_secure/dynamic_permissions/c++11/dynamic_permissions_subscriber.cxx	Implements a subscriber for the dynamic permissions example.
examples/connext_secure/dynamic_permissions/c++11/dynamic_permissions_publisher.cxx	Implements a publisher that updates its Permissions Document after a set sample count.
examples/connext_secure/dynamic_permissions/c++11/dynamic_permissions.idl	Defines the DynamicPermissions structure.
examples/connext_secure/dynamic_permissions/c++11/application.hpp, application.h	Provide application helper functions and argument parsing for the examples.
examples/connext_secure/dynamic_permissions/c++11/USER_QOS_PROFILES.xml	Configures QoS profiles for the dynamic permissions example.
examples/connext_secure/dynamic_permissions/c++11/CMakeLists.txt	Defines build rules for the dynamic permissions example.
examples/connext_secure/dynamic_permissions/README.md	Documents the example usage and builds instructions.
examples/connext_secure/CMakeLists.txt	Integrates the new dynamic permissions example into the secure examples set.

Comments suppressed due to low confidence (1)

examples/connext_secure/dynamic_permissions/README.md:48

• The subscriber command in the README appears to have a typo ('sh.' prefix). It should probably be updated to simply './dynamic_permissions_subscriber' to avoid confusion.

sh./dynamic_permissions_subscriber