Add support for ГОСТ Р 34.10 digital signatures

- Implemented the GostKeyValue class for handling public key parameters in ГОСТ Р 34.10 digital signatures.
- Created the GostSignedXml class to manage XML signatures using ГОСТ 34.10, including methods for computing and checking signatures.
- Developed the GostSignedXmlImpl class to encapsulate the signature computation logic and public key retrieval.
- Added specific key value classes for ГОСТ Р 34.10-2001, ГОСТ Р 34.10-2012/256, and ГОСТ Р 34.10-2012/512 to support different signature algorithms.
- Ensured compatibility with existing XML signature standards while integrating ГОСТ cryptography.

src/__Libraries/StellaOps.Cryptography.DependencyInjection/StellaOpsCryptoOptions.cs

@@ -1,5 +1,8 @@
-using StellaOps.Cryptography.Plugin.CryptoPro;
+using StellaOps.Cryptography.Plugin.OpenSslGost;
 using StellaOps.Cryptography.Plugin.Pkcs11Gost;
+#if STELLAOPS_CRYPTO_PRO
+using StellaOps.Cryptography.Plugin.CryptoPro;
+#endif
 
 namespace StellaOps.Cryptography.DependencyInjection;
 
@@ -7,7 +10,11 @@ public sealed class StellaOpsCryptoOptions
 {
     public CryptoProviderRegistryOptions Registry { get; set; } = new();
 
+#if STELLAOPS_CRYPTO_PRO
     public CryptoProGostProviderOptions CryptoPro { get; set; } = new();
+#endif
 
     public Pkcs11GostProviderOptions Pkcs11 { get; set; } = new();
+
+    public OpenSslGostProviderOptions OpenSsl { get; set; } = new();
 }