[wip] Slowlog monitoring feature

[makky3939]

I added the Redis slowlog monitoring API feature and UI.

Server side tasks:

• [x] Scheduler
• [x] API
• [ ] Notification(email)
• [ ] test

Client side tasks:

• [x] Tab and page
• [x] API util
• [x] Action and store(flux)
• [ ] Filter UI (nodes and date range)
• [ ] test

[be-hase]

Thanks ! I will check later.

[be-hase]

I think that merge slow log by each cluster is good. So I close this PR, then I create new PR. Thanks.