【功能新增】INFRA：增加 ConfigApi，支持参数配置的读取

yudao-module-infra/yudao-module-infra-api/src/main/java/cn/iocoder/yudao/module/infra/api/config/ConfigApi.java

@@ -0,0 +1,21 @@
+package cn.iocoder.yudao.module.infra.api.config;
+
+import cn.iocoder.yudao.framework.common.pojo.CommonResult;
+import cn.iocoder.yudao.module.infra.enums.ApiConstants;
+import io.swagger.v3.oas.annotations.Operation;
+import io.swagger.v3.oas.annotations.tags.Tag;
+import org.springframework.cloud.openfeign.FeignClient;
+import org.springframework.web.bind.annotation.GetMapping;
+import org.springframework.web.bind.annotation.RequestParam;
+
+@FeignClient(name = ApiConstants.NAME) // TODO 芋艿：fallbackFactory =
+@Tag(name = "RPC 服务 - 参数配置")
+public interface ConfigApi {
+
+    String PREFIX = ApiConstants.PREFIX + "/config";
+
+    @GetMapping(PREFIX + "/get-value-by-key")
+    @Operation(summary = "根据参数键查询参数值")
+    CommonResult<String> getConfigValueByKey(@RequestParam("key") String key);
+
+}