docdb: expose almost all options to user (#231)

[ti-chi-bot]

This is an automated cherry-pick of #231

What problem does this PR solve?

Issue Number: ref https://github.com/pingcap/ng-monitoring/issues/230

What is changed and how it works?

1. Expose almost all badger db options to ngm's config.
2. Adjust some options to the defaults of badger.

[mornyx]

/lgtm

[ti-chi-bot[bot]]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: mornyx

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Needs approval from an approver in each of these files: - ~~[OWNERS](https://github.com/pingcap/ng-monitoring/blob/release-6.5/OWNERS)~~ [mornyx] Approvers can indicate their approval by writing `/approve` in a comment Approvers can cancel approval by writing `/approve cancel` in a comment

[ti-chi-bot[bot]]

[LGTM Timeline notifier]

Timeline:

• 2024-02-28 13:26:25.735319727 +0000 UTC m=+1054874.482942835: :ballot_box_with_check: agreed by mornyx.