NFC-99 Add WithOcspClient method

Author: SanderKondratjevNortal

src/WebEid.Security/Validator/AuthTokenValidatorBuilder.cs

@@ -177,6 +177,17 @@ public AuthTokenValidatorBuilder WithDesignatedOcspServiceConfiguration(Designat
             return this;
         }
 
+        /// <summary>
+        /// Configures a custom OCSP client for user certificate revocation checking.
+        /// </summary>
+        /// <returns>the builder instance for method chaining</returns>
+        public AuthTokenValidatorBuilder WithOcspClient(IOcspClient ocspClient)
+        {
+            this.ocspClient = ocspClient;
+            logger?.LogDebug("Custom OCSP client configured");
+            return this;
+        }
+
         /// <summary>
         /// Validates the configuration and builds the <see cref="AuthTokenValidator"/> object with it.
         /// The returned <see cref="AuthTokenValidator"/> object is immutable/thread-safe.