test.c: Improved testing

Top-level test extraction into typed sub-functions

- Digest tests (MD5, SHA-1, SHA-224, SHA-256, SHA-384, SHA-512,
SHA-512/224,   SHA-512/256, SHA-3 224/256/384/512, SHAKE128/256): each
test category (KAT, large-hash, copy-cleanup, unaligned-memory,
interleave, copy-Sha3 heap-allocation pattern) is now its own static
wc_test_ret_t function rather than inline blocks inside one giant
top-level test.
- rsa_test: extracted rsa_pkcs1_test, rsa_cert_parse_test,
rsa_pub_key_decode_test, rsa_certreq_test.
- ecc_test: extracted ecc_test_all_curves, ecc_test_all_deterministic_k
from the dispatcher; ecc_encrypt_combos_test from ecc_encrypt_test;
ecc_buffers_encrypt_test, ecc_buffers_sign_verify_test,
ecc_buffers_pub_key_decode_test from ecc_test_buffers.
- dh_test: extracted dh_keyagree_test, dh_check_priv_key_test,
dh_agree_ct_test, dh_key_import_export_test, dh_set_check_key_test.
- Curve25519 / Ed25519 / Curve448 / Ed448: extracted KAT, key-agreement,
ASN, and rare-sig sub-tests from each top-level dispatcher.
- Cipher tests: extracted streaming sub-tests from aesofb_test,
aescfb_test, aes_cts_test (aes_cts_192/256_stream_test).

Coverage additions

- Added state-copy testing inside the SHA-3 KAT loops (matching the
existing pattern in SHA-1/224/256/etc. KAT loops).
- Added a SHA-224 large-hash test (parity with the other digest
families).
- Added copy-cleanup tests for SHA-512/224 and SHA-512/256.
- Added Unaligned memory access testing to all *_large_hash_test
functions (MD5, SHA-1/224/256/384, SHA3-224/256/384/512), matching the
pattern that previously only existed for SHA-512/224/256.

Author: SparkiDev