[improve][broker] Add broker interceptor conf (apache#20719)

Author: crossoverJie

conf/broker.conf

@@ -1823,3 +1823,12 @@ managedLedgerCacheEvictionFrequency=0
 # Number of worker threads to serve non-persistent topic
 # Deprecated - use topicOrderedExecutorThreadNum instead.
 numWorkerThreadsForNonPersistentTopic=
+
+# The directory to locate broker interceptors
+brokerInterceptorsDirectory=./interceptors
+
+# List of broker interceptor to load, which is a list of broker interceptor names
+brokerInterceptors=
+
+# Enable or disable the broker interceptor, which is only used for testing for now
+disableBrokerInterceptors=true

conf/standalone.conf

@@ -1269,3 +1269,12 @@ delayedDeliveryMaxIndexesPerBucketSnapshotSegment=5000
 # after reaching the max buckets limitation, the adjacent buckets will be merged.
 # (disable with value -1)
 delayedDeliveryMaxNumBuckets=-1
+
+# The directory to locate broker interceptors
+brokerInterceptorsDirectory=./interceptors
+
+# List of broker interceptor to load, which is a list of broker interceptor names
+brokerInterceptors=
+
+# Enable or disable the broker interceptor, which is only used for testing for now
+disableBrokerInterceptors=true