feat: fine tune for background compaction

[ZhiHanZ]

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Summary

1. background compaction would not happend if table compacted after the last update time
2. add updated_on field for system.table and system.background_tasks.

Closes #issue

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1 Ignored Deployment

Name	Status	Preview	Comments	Updated (UTC)
databend	⬜️ Ignored (Inspect)			Jun 20, 2023 1:14pm

[ZhiHanZ]

cc @TCeason , this PR changed the create_on and drop_on field of system.tables into timestamp, PTAL if you have time, since I am not sure about whether current mysql integrations have special concerns on those fields

[TCeason]

cc @TCeason , this PR changed the create_on and drop_on field of system.tables into timestamp, PTAL if you have time, since I am not sure about whether current mysql integrations have special concerns on those fields

I think this is ok.

https://github.com/datafuselabs/databend/blob/0018dced004a8bc20e91716ea80747dd2b405d7d/src/query/storages/information-schema/src/tables_table.rs#L61

Now mysql intergration only will access information_schema. And only use tables.create_on as information_schema.tables.create_time.

In MySQL this field information_schema.tables.create_time type is timestamp.

// | CREATE_TIME     | timestamp                                                          | NO   |     | NULL    |       |