feat: implement automatic hashicorp token renewal (eclipse-edc#3782)

* feat: add PrefixMonitor (eclipse-edc#3510)

* feat: add token rotation mechanism

* test: adding tests for hashicorp token rotation

* fix: fix checkstyle errors

* fix: set empty list when policies null

* docs: update DEPENDENCIES

* fix: pr comments

* fix: pr comments

* fix: pr comments

* add custom retry mechanism to token renewal

* merge upstream main

* minor fixes

* extract hashicorp config value validation into separate class

* checkstyle fixes

* remove vault timeout config

* clean up

* added ConfigImplTest test for double config

* remove root token property from token look up data

* use in-built retry mechanism of EdcHttpClient for token operations

* using single thread executor for hashicorp client

* remove retry config from HashicorpVaultConfig

* revert config impl changes

* revert SettingResolver changes

* test call of FallbackFactories.retryWhenStatusIsNotIn(..) with static mocks

* implement custom Fallback factory for hashicorp client

* replace token dto classes by map<string, object>

* merge upstream

* update pr comments

* update pr comments

* update pr comments

* clean up merge

* merge main into feature branch

extensions/common/vault/vault-hashicorp/src/main/java/org/eclipse/edc/vault/hashicorp/HashicorpVaultClientFallbackFactory.java

@@ -0,0 +1,37 @@
+/*
+ *  Copyright (c) 2024 Mercedes-Benz Tech Innovation GmbH
+ *
+ *  This program and the accompanying materials are made available under the
+ *  terms of the Apache License, Version 2.0 which is available at
+ *  https://www.apache.org/licenses/LICENSE-2.0
+ *
+ *  SPDX-License-Identifier: Apache-2.0
+ *
+ *  Contributors:
+ *       Mercedes-Benz Tech Innovation GmbH - Implement automatic Hashicorp Vault token renewal
+ *
+ */
+
+package org.eclipse.edc.vault.hashicorp;
+
+import dev.failsafe.Fallback;
+import okhttp3.Request;
+import okhttp3.Response;
+import org.eclipse.edc.spi.http.FallbackFactory;
+
+import static org.eclipse.edc.spi.http.FallbackFactories.retryWhenStatusIsNotIn;
+
+/**
+ * Implements a {@link Fallback}factory for requests executed against the Hashicorp Vault.
+ *
+ * @see <a href="https://developer.hashicorp.com/vault/api-docs">Hashicorp Vault Api</a> for more information on retryable error codes.
+ */
+public class HashicorpVaultClientFallbackFactory implements FallbackFactory {
+
+    private static final int[] NON_RETRYABLE_STATUS_CODES = {200, 204, 400, 403, 404, 405};
+
+    @Override
+    public Fallback<Response> create(Request request) {
+        return retryWhenStatusIsNotIn(NON_RETRYABLE_STATUS_CODES).create(request);
+    }
+}