feat: task_advice system table

[BohuTANG]

Summary

Add a system table for advice the background serivice:

catalog_name	database_name	table_name	task_type	need_run	task_sql	reason(variant)
default	db	xx	COMPACT	1	optimize table xx compact limit 3	"{status in json}"
default	db	xx	AGGREGATING_INDEX	0	refresh aggregating index xx_agg_idx limit 10	"{status in json}"
default	db	yy	ADD_CLUSTER_KEY	1	alter table yy cluster by(col1)	"{status in json}"

[BohuTANG]

@ZhiHanZ this task_advice table need your advices :/

[flaneur2020]

SHOW ADVICES FOR TABLE xxx;

[sundy-li]

The compaction service needs to know the endpoints of the query nodes to fetch the result from advice table. But the query nodes are serverless and multi-tenant.

Since the compaction service must depend on S3 and metaservice, why not fetch the advice in the compaction service on schedule?

[BohuTANG]

why not fetch the advice in the compaction service on schedule?

We can execute the advices in the cloud background service. However, this issue extends beyond just background services; Aims to give some advices for the tables in databases, and tell the user how to do next.

[BohuTANG]

Reference: Oracle Database Advisors: https://blogs.oracle.com/coretec/post/oracle-database-advisors-overview