[opt](cloud) Exposes cloud balance metrics

[deardeng]

What problem does this PR solve?

Exposes cloud balance related metrics to show whether the compute group is performing balance scheduling. When *_balance_num metrics are all 0, the current compute group is considered to be in a balanced state.
Note: These metrics are valid only when requesting the fe master (balance scheduling is performed on the fe master)

 curl "http://175.42.1.1:8030/metrics" |rg '_balance_num'
# HELP doris_fe_cloud_table_balance_num current cluster cloud table balance sync edit log number
# TYPE doris_fe_cloud_table_balance_num counter
doris_fe_cloud_table_balance_num{cluster_id="compute_cluster_id", cluster_name="compute_cluster"} 5
doris_fe_cloud_table_balance_num{cluster_id="other_cluster_id", cluster_name="other_cluster"} 0
# HELP doris_fe_cloud_partition_balance_num current cluster cloud partition balance sync edit log number
# TYPE doris_fe_cloud_partition_balance_num counter
doris_fe_cloud_partition_balance_num{cluster_id="compute_cluster_id", cluster_name="compute_cluster"} 0
doris_fe_cloud_partition_balance_num{cluster_id="other_cluster_id", cluster_name="other_cluster"} 0
# HELP doris_fe_cloud_smooth_upgrade_balance_num current cluster cloud smooth upgrade sync edit log number
# TYPE doris_fe_cloud_smooth_upgrade_balance_num counter
doris_fe_cloud_smooth_upgrade_balance_num{cluster_id="compute_cluster_id", cluster_name="compute_cluster"} 0
doris_fe_cloud_smooth_upgrade_balance_num{cluster_id="other_cluster_id", cluster_name="other_cluster"} 0
# HELP doris_fe_cloud_global_balance_num current cluster cloud be balance sync edit log number
# TYPE doris_fe_cloud_global_balance_num counter
doris_fe_cloud_global_balance_num{cluster_id="compute_cluster_id", cluster_name="compute_cluster"} 0
doris_fe_cloud_global_balance_num{cluster_id="other_cluster_id", cluster_name="other_cluster"} 0
# HELP doris_fe_cloud_warm_up_balance_num current cluster cloud warm up cache sync edit log number
# TYPE doris_fe_cloud_warm_up_balance_num counter
doris_fe_cloud_warm_up_balance_num{cluster_id="compute_cluster_id", cluster_name="compute_cluster"} 0
doris_fe_cloud_warm_up_balance_num{cluster_id="other_cluster_id", cluster_name="other_cluster"} 0

Issue Number: close #xxx

Related PR: #xxx

Problem Summary:

Release note

None

Check List (For Author)

• Test

  • Regression test
  • Unit Test
  • Manual test (add detailed scripts or steps below)
  • No need to test or manual test. Explain why:
    • This is a refactor/code format and no logic has been changed.
    • Previous test can cover this change.
    • No code files have been changed.
    • Other reason

• Behavior changed:

  • No.
  • Yes.

• Does this need documentation?

  • No.
  • Yes.

Check List (For Reviewer who merge this PR)

• Confirm the release note
• Confirm test cases
• Confirm document
• Add branch pick label

[hello-stephen]

Thank you for your contribution to Apache Doris.
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Please clearly describe your PR:

1. What problem was fixed (it's best to include specific error reporting information). How it was fixed.
2. Which behaviors were modified. What was the previous behavior, what is it now, why was it modified, and what possible impacts might there be.
3. What features were added. Why was this function added?
4. Which code was refactored and why was this part of the code refactored?
5. Which functions were optimized and what is the difference before and after the optimization?

[deardeng]

run buildall

[doris-robot]

ClickBench: Total hot run time: 28.37 s

machine: 'aliyun_ecs.c7a.8xlarge_32C64G'
scripts: https://github.com/apache/doris/tree/master/tools/clickbench-tools
ClickBench test result on commit 95d801f077426cf08d45c4e4b2a9a64b3a508416, data reload: false
query1	0.06	0.05	0.05
query2	0.09	0.05	0.06
query3	0.25	0.09	0.09
query4	1.61	0.12	0.12
query5	0.27	0.26	0.24
query6	1.20	0.63	0.64
query7	0.02	0.03	0.03
query8	0.06	0.04	0.04
query9	0.63	0.53	0.53
query10	0.59	0.58	0.57
query11	0.17	0.12	0.14
query12	0.15	0.14	0.12
query13	0.63	0.62	0.60
query14	1.02	1.05	1.01
query15	0.88	0.85	0.88
query16	0.39	0.39	0.38
query17	1.06	1.12	1.06
query18	0.22	0.20	0.20
query19	1.95	1.84	1.83
query20	0.01	0.01	0.02
query21	15.42	0.18	0.12
query22	5.11	0.07	0.05
query23	15.65	0.26	0.10
query24	2.82	1.42	0.38
query25	0.10	0.06	0.07
query26	0.14	0.13	0.13
query27	0.08	0.05	0.05
query28	4.78	1.13	0.92
query29	12.61	3.96	3.38
query30	0.29	0.14	0.11
query31	2.83	0.58	0.38
query32	3.25	0.55	0.47
query33	3.13	3.09	3.10
query34	15.98	5.48	4.87
query35	4.92	4.91	4.87
query36	0.71	0.52	0.50
query37	0.11	0.07	0.07
query38	0.07	0.04	0.04
query39	0.04	0.02	0.03
query40	0.17	0.16	0.15
query41	0.09	0.03	0.03
query42	0.04	0.03	0.02
query43	0.04	0.03	0.03
Total cold run time: 99.64 s
Total hot run time: 28.37 s

[hello-stephen]

FE UT Coverage Report

Increment line coverage 0.00% (0/71) 🎉
Increment coverage report
Complete coverage report

[hello-stephen]

FE Regression Coverage Report

Increment line coverage 29.58% (21/71) 🎉
Increment coverage report
Complete coverage report

[deardeng]

run p0

[deardeng]

run nonConcurrent

[github-actions]

PR approved by at least one committer and no changes requested.

[github-actions]

PR approved by anyone and no changes requested.

[hello-stephen]

FE Regression Coverage Report

Increment line coverage 29.58% (21/71) 🎉
Increment coverage report
Complete coverage report

[hello-stephen]

FE Regression Coverage Report

Increment line coverage 29.58% (21/71) 🎉
Increment coverage report
Complete coverage report