feat(top_slowquery): support multiple db and statement type filter

[baurine]

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[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 26.19%. Comparing base (5e932ec) to head (cdbfd1f). Report is 4 commits behind head on master.

:exclamation: Current head cdbfd1f differs from pull request most recent head 97809e0. Consider uploading reports for the commit 97809e0 to get more accurate results

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #1667 +/- ## ========================================== + Coverage 23.68% 26.19% +2.51% ========================================== Files 177 97 -80 Lines 16055 10570 -5485 ========================================== - Hits 3802 2769 -1033 + Misses 11968 7616 -4352 + Partials 285 185 -100 ``` | [Flag](https://app.codecov.io/gh/pingcap/tidb-dashboard/pull/1667/flags?src=pr&el=flags&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=pingcap) | Coverage Δ | | |---|---|---| | [backend_integration](https://app.codecov.io/gh/pingcap/tidb-dashboard/pull/1667/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=pingcap) | `?` | | | [backend_ut](https://app.codecov.io/gh/pingcap/tidb-dashboard/pull/1667/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=pingcap) | `26.19% <ø> (ø)` | | Flags with carried forward coverage won't be shown. [Click here](https://docs.codecov.io/docs/carryforward-flags?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=pingcap#carryforward-flags-in-the-pull-request-comment) to find out more. ------ [Continue to review full report in Codecov by Sentry](https://app.codecov.io/gh/pingcap/tidb-dashboard/pull/1667?dropdown=coverage&src=pr&el=continue&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=pingcap). > **Legend** - [Click here to learn more](https://docs.codecov.io/docs/codecov-delta?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=pingcap) > `Δ = absolute (impact)`, `ø = not affected`, `? = missing data` > Powered by [Codecov](https://app.codecov.io/gh/pingcap/tidb-dashboard/pull/1667?dropdown=coverage&src=pr&el=footer&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=pingcap). Last update [0119d12...97809e0](https://app.codecov.io/gh/pingcap/tidb-dashboard/pull/1667?dropdown=coverage&src=pr&el=lastupdated&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=pingcap). Read the [comment docs](https://docs.codecov.io/docs/pull-request-comments?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=pingcap).

[ti-chi-bot[bot]]

@mornyx: adding LGTM is restricted to approvers and reviewers in OWNERS files.

In response to [this](https://github.com/pingcap/tidb-dashboard/pull/1667#pullrequestreview-2042593935): > Instructions for interacting with me using PR comments are available [here](https://git.k8s.io/community/contributors/guide/pull-requests.md). If you have questions or suggestions related to my behavior, please file an issue against the [kubernetes/test-infra](https://github.com/kubernetes/test-infra/issues/new?title=Prow%20issue:) repository.

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