- Use "new" math library WOLFSSL_SP_MATH_ALL, which is now  promoted by
  WolfSSL for faster performance. "fastmath" we  used previously is going
  to be deprecated, it was not really always fast.
- Optimize common RSA math operations with WOLFSSL_HAVE_SP_RSA
- Incorporate assembly optimizations, currently for Intel x64 only

This patch significantly reduces execution time for SSL tests like
main.ssl-big and main.ssl_connect, which now run 2 to 3 times faster.

Notably, when this patch is applied to 11.4, server startup in with
ephemeral certificates becomes approximately 10x faster due to optimized
wolfSSL_EVP_PKEY_keygen().

Additionally, refactored WolfSSL by removing old workarounds and
consolidating wolfssl and wolfcrypt into a single library wolfssl, just
like it was done in WolfSSL's own CMake.