refactor ED routines to pivot on WOLFSSL_ED*_PERSISTENT_SHA and WOLFSSL_ED*_STREAMING_VERIFY macros, with sha state in the key struct only when WOLFSSL_ED*_PERSISTENT_SHA, otherwise on the stack as before;
add ed*_hash_init() and ed*_hash_free() local helpers;
ED* peer review: fix line lengths, remove superfluous retval checks, tweaks for efficiency, and add ED448_PREHASH_SIZE to ed448.h.
harmonize the ED448 API with the ED25519 API by making wc_ed448_verify_msg_ex() and wc_ed448_init_ex() public functions;
track devId and heap pointer in ed*_key.{devId,heap}, and pass them through to sha init functions;
add ed*_key.{sha,sha_clean_flag}, and ed*_hash_{reset,update,final} functions, and use them for all ED hashing ops, to support streaming API and for optimally efficient reuse for the preexisting ED calls;
add ed448_hash() akin to ed25519_hash(), and use it in place of wc_Shake256Hash(), for .sha_clean_flag dynamics.
add to wc_ed*_import_private_key() the ability to import the combined key generated by wc_ed*_export_private() without supplying the redundant public key;
add macro asserts near top of ed*.h to assure the required hash functions are available;
fix {NO,HAVE}_ED*_{SIGN,VERIFY};
wolfcrypt/test/test.c: add missing key initializations in ed*_test();
wolfcrypt/test/test.c: fix unaligned access in myDecryptionFunc() detected by -fsanitize=address,undefined.
