[C++] Explicitly define copy constructor for AnyBase

[g3bk47]

Changes proposed in this pull request

Gcc 14.2 generates a warning (-Wdeprecated-copy) for AnyBase because the assignment operator is defined explicitly but the copy constructor is defined implicitly.

Checklist

• The pull request includes a clear description of this code change
• Commit messages have short titles and reference relevant issues
• Build passes (scons build & scons test) and unit tests address code coverage
• Style & formatting of contributed code follows contributing guidelines
• The pull request is ready for review

[ischoegl]

Thank you @g3bk47 … this change looks good to me.