[KYUUBI #2089] Add debugging instructions for Flink engine

### _Why are the changes needed?_

Add debugging instructions for Flink engine.

### _How was this patch tested?_
- [ ] Add some test cases that check the changes thoroughly including negative and positive cases if possible

- [ ] Add screenshots for manual tests if appropriate

- [x] [Run test](https://kyuubi.apache.org/docs/latest/develop_tools/testing.html#running-tests) locally before make a pull request

Closes #2098 from SteNicholas/KYUUBI-2089.

Closes #2089

08189b85 [SteNicholas] [KYUUBI #2089] Add debugging instructions for flink engine

Authored-by: SteNicholas <programgeek@163.com>
Signed-off-by: Kent Yao <yao@apache.org>
(cherry picked from commit 2486c5dff3)
Signed-off-by: Kent Yao <yao@apache.org>

docs/develop_tools/debugging.md

@@ -46,6 +46,8 @@ In the IDE, you set the corresponding parameters(host&port) in debug configurati
 
 ## Debugging Apps
 
+### Spark Engine
+
 - Spark Driver
 
 ```bash
@@ -53,6 +55,39 @@ spark.driver.extraJavaOptions   -agentlib:jdwp=transport=dt_socket,server=y,susp
 ```
 
 - Spark Executor
+
 ```bash
 spark.executor.extraJavaOptions   -agentlib:jdwp=transport=dt_socket,server=y,suspend=y,address=5005
+```
+
+### Flink Engine
+
+- Flink Processes
+
+```bash
+env.java.opts   -agentlib:jdwp=transport=dt_socket,server=y,suspend=y,address=5005
+```
+
+- Flink JobManager
+
+```bash
+env.java.opts.jobmanager   -agentlib:jdwp=transport=dt_socket,server=y,suspend=y,address=5005
+```
+
+- Flink TaskManager
+
+```bash
+env.java.opts.taskmanager   -agentlib:jdwp=transport=dt_socket,server=y,suspend=y,address=5005
+```
+
+- Flink HistoryServer
+
+```bash
+env.java.opts.historyserver   -agentlib:jdwp=transport=dt_socket,server=y,suspend=y,address=5005
+```
+
+- Flink Client
+
+```bash
+env.java.opts.client   -agentlib:jdwp=transport=dt_socket,server=y,suspend=y,address=5005
 ```