Implement a public BIO_ADDR_copy() function

Implement a public BIO_ADDR_copy() function

We already have BIO_ADDR_dup() but in some contexts that is not sufficent.
We implement BIO_ADDR_copy() and make BIO_ADDR_dup() use it.

Reviewed-by: Tomas Mraz <tomas@openssl.org>
Reviewed-by: Tim Hudson <tjh@openssl.org>
Reviewed-by: Paul Dale <pauli@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/22164)