openssl3 integration: workaround for new EVP_Cipher return code

[toidiu]

Description of changes:

In openssl3 EVP_Cipher checks if a provider has been set and then introduces different functionality:

• before: returns 1 on success or 0 on failure
• now: returns the amount of encrypted / decrypted bytes, or -1 on failure

So based on the source code, openssl3 now checks if there is a provider (cipher→prov) set on the ctx and based on that triggers the new behavior.

Fix1 (recommended):
A solution is to use EVP_EncryptUpdate and EVP_DecryptUpdate as is done in the other cipher implemenations: code.

pros:

• avoids the new return code behavior change
• consolidates cipher impl across the codebase

Fix2:
Since in ossl3 we load the "default" and "legacy" providers, we can assume and handle the new return code behavior.

This however introduces the need for ifdef which makes the code more complicated to reason about.

Testing:

Locally unit test passes in ossl3 and also ossl2 locally.

-------libcrypto
    libcrypto.so.3 => /home/ubuntu/projects/rsync/s2n-tls/test-deps/openssl-3.0/lib/libcrypto.so.3 (0x00007fe95a89e000)
-------libcrypto

~/projects/rsync/s2n-tls/tests/unit ~/projects/rsync/s2n-tls
Running /home/ubuntu/projects/rsync/s2n-tls/tests/unit/s2n_aes_sha_composite_test.c ... PASSED    2297077 tests
Running /home/ubuntu/projects/rsync/s2n-tls/tests/unit/s2n_certificate_test.c ... PASSED        392 tests
Running /home/ubuntu/projects/rsync/s2n-tls/tests/unit/s2n_client_hello_test.c ... PASSED        708 tests
Running /home/ubuntu/projects/rsync/s2n-tls/tests/unit/s2n_extension_type_test.c ... PASSED        306 tests
Running /home/ubuntu/projects/rsync/s2n-tls/tests/unit/s2n_mutual_auth_test.c ... PASSED        634 tests
Running /home/ubuntu/projects/rsync/s2n-tls/tests/unit/s2n_optional_client_auth_test.c ... PASSED        774 tests
Running /home/ubuntu/projects/rsync/s2n-tls/tests/unit/s2n_record_size_test.c ... PASSED        183 tests
Running /home/ubuntu/projects/rsync/s2n-tls/tests/unit/s2n_self_talk_offload_signing_test.c ... PASSED         59 tests
Running /home/ubuntu/projects/rsync/s2n-tls/tests/unit/s2n_handshake_test.c ... PASSED       2961 tests
Running /home/ubuntu/projects/rsync/s2n-tls/tests/unit/s2n_self_talk_nonblocking_test.c ... PASSED        271 tests

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license.