[Enhancement] Add source progress to result of show routine load (branch-3.1) (backport #35816)

[rickif]

This is a backport of #35816 to branch-3.1

Why I'm doing:
We need a easy way to check the lag of routine load job.
What I'm doing:
This PR adds SourceProgress to the result of show routine load, which denotes the producer's progress. In this way, we can check the lag of routine load job easily. Meanwhile, little overhead is added to the show routine load.

MySQL [db0]> show routine load\G;
*************************** 1. row ***************************
                  Id: 15008
                Name: rl_simple
          CreateTime: 2023-11-27 16:31:18
           PauseTime: NULL
             EndTime: NULL
              DbName: db0
           TableName: tbl_simple
               State: RUNNING
      DataSourceType: KAFKA
      CurrentTaskNum: 1
       JobProperties: {"partitions":"*","partial_update":"false","columnToColumnExpr":"key1,key2","maxBatchIntervalS":"10","partial_update_mode":"null","whereExpr":"*","dataFormat":"json","timezone":"GMT+08:00","format":"json","log_rejected_record_num":"0","taskTimeoutSecond":"60","json_root":"","maxFilterRatio":"1.0","strict_mode":"false","jsonpaths":"","taskConsumeSecond":"15","desireTaskConcurrentNum":"5","maxErrorNum":"0","strip_outer_array":"false","currentTaskConcurrentNum":"1","maxBatchRows":"200000"}
DataSourceProperties: {"topic":"topic-simple-json-continuous1","currentKafkaPartitions":"0","brokerList":"127.0.0.1:49092"}
    CustomProperties: {"group.id":"rl_simple_6dd18de6-a46d-4d43-8f36-4c71433cd5c5"}
           Statistic: {"receivedBytes":0,"errorRows":0,"committedTaskNum":0,"loadedRows":0,"loadRowsRate":0,"abortedTaskNum":13,"totalRows":0,"unselectedRows":0,"receivedBytesRate":0,"taskExecuteTimeMs":1}
            Progress: {"0":"1007861"}
ReasonOfStateChanged: 
        ErrorLogUrls: 
         TrackingSQL: 
            OtherMsg: 
LatestSourcePosition: {"0":"2053532"}

Fixes #issue

What type of PR is this:

• BugFix
• Feature
• Enhancement
• Refactor
• UT
• Doc
• Tool

Does this PR entail a change in behavior?

• Yes, this PR will result in a change in behavior.
• No, this PR will not result in a change in behavior.

If yes, please specify the type of change:

• Interface/UI changes: syntax, type conversion, expression evaluation, display information
• Parameter changes: default values, similar parameters but with different default values
• Policy changes: use new policy to replace old one, functionality automatically enabled
• Feature removed
• Miscellaneous: upgrade & downgrade compatibility, etc.

Checklist:

• I have added test cases for my bug fix or my new feature
• This pr needs user documentation (for new or modified features or behaviors)
  • I have added documentation for my new feature or new function
• This is a backport pr

Bugfix cherry-pick branch check:

• I have checked the version labels which the pr will be auto-backported to the target branch
  • 3.2
  • 3.1
  • 3.0
  • 2.5

[sonarqubecloud]

Quality Gate passed

Kudos, no new issues were introduced!

0 New issues
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarCloud

[github-actions]

[FE Incremental Coverage Report]

✅ pass : 14 / 15 (93.33%)

file detail

	path	covered_line	new_line	coverage	not_covered_line_detail
🔵	com/starrocks/load/routineload/PulsarRoutineLoadJob.java	0	1	00.00%	[133]
🔵	com/starrocks/load/routineload/RoutineLoadJob.java	1	1	100.00%	[]
🔵	com/starrocks/load/routineload/KafkaTaskInfo.java	3	3	100.00%	[]
🔵	com/starrocks/load/routineload/KafkaRoutineLoadJob.java	9	9	100.00%	[]
🔵	com/starrocks/sql/ast/ShowRoutineLoadStmt.java	1	1	100.00%	[]

[github-actions]

[BE Incremental Coverage Report]

✅ pass : 0 / 0 (0%)