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.

etc/rootpack/ru/crypto.profile.yaml

@@ -8,6 +8,7 @@ StellaOps:
         ru-offline:
           PreferredProviders:
             - ru.cryptopro.csp
+            - ru.openssl.gost
             - ru.pkcs11
     CryptoPro:
       Keys:
@@ -27,6 +28,14 @@ StellaOps:
           Pin: "${PKCS11_PIN}"
           PrivateKeyLabel: rootpack-signing
           CertificateThumbprint: "<thumbprint>"
+    OpenSsl:
+      Keys:
+        - KeyId: ru-openssl-default
+          Algorithm: GOST12-256
+          PrivateKeyPath: /opt/stellaops/keys/ru_openssl_priv.pem
+          PrivateKeyPassphraseEnvVar: RU_OPENSSL_PRIV_PASS
+          CertificatePath: /opt/stellaops/certs/ru_openssl_cert.pem
+          SignatureFormat: Der
     Diagnostics:
       Providers:
         Enabled: true