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.Configuration/StellaOpsCryptoOptions.cs

@@ -1,7 +1,9 @@
 using StellaOps.Cryptography;
 using StellaOps.Cryptography.DependencyInjection;
-using StellaOps.Cryptography.Plugin.CryptoPro;
 using StellaOps.Cryptography.Plugin.Pkcs11Gost;
+#if STELLAOPS_CRYPTO_PRO
+using StellaOps.Cryptography.Plugin.CryptoPro;
+#endif
 
 namespace StellaOps.Configuration;
 
@@ -13,8 +15,9 @@ public sealed class StellaOpsCryptoOptions
     public CryptoProviderRegistryOptions Registry { get; } = new();
 
     public Pkcs11GostProviderOptions Pkcs11 { get; } = new();
-
+#if STELLAOPS_CRYPTO_PRO
     public CryptoProGostProviderOptions CryptoPro { get; } = new();
+#endif
 
     public string DefaultHashAlgorithm { get; set; } = HashAlgorithms.Sha256;
 }