wrapper/CSharp/wolfSSL_CSharp/wolfCrypt.cs: update for new calling conventions around wc_AesNew, wc_curve25519_new, wc_ed25519_new, wc_HashNew, and wc_NewRsaKey, and the corresponding delete functions.
* Adds RNG, ECC(ECIES and ECDHE), RSA, ED25519/Curve25519, AES-GCM, and Hashing to the CSharp wrapper.
* Adds GitHub action for building the CSharp wrapper solution and running wolfCrypt test and a TLS server/client example.
* Adds "new" API's for wolfCrypt for platforms that cannot tolerate the structs directly.
* Fixes for several scan-build warnings.