feat: add zeebe self managed props

(cherry picked from commit 17fcadd)

spring-boot-starter-camunda/src/main/java/io/camunda/zeebe/spring/client/properties/ZeebeSelfManagedProperties.java

@@ -0,0 +1,43 @@
+package io.camunda.zeebe.spring.client.properties;
+
+import org.springframework.beans.factory.annotation.Value;
+import org.springframework.boot.context.properties.ConfigurationProperties;
+
+@ConfigurationProperties(prefix = "zeebe")
+public class ZeebeSelfManagedProperties {
+
+  @Value("${zeebe.authorization.server.url:#{null}}")
+  private String authServer;
+
+  @Value("${zeebe.client.id:#{null}}")
+  private String clientId;
+
+  @Value("${zeebe.client.secret:#{null}}")
+  private String clientSecret;
+
+  @Value("${zeebe.token.audience:#{null}}")
+  private String audience;
+
+  @Value("${zeebe.client.broker.gatewayAddress:#{null}}")
+  private String gatewayAddress;
+
+  public String getAuthServer() {
+    return authServer;
+  }
+
+  public String getClientId() {
+    return clientId;
+  }
+
+  public String getClientSecret() {
+    return clientSecret;
+  }
+
+  public String getAudience() {
+    return audience;
+  }
+
+  public String getGatewayAddress() {
+    return gatewayAddress;
+  }
+}