feat: Add liveness probe for DB

[gaocegege]

What this PR does / why we need it:

Which issue(s) this PR fixes (optional, in fixes #<issue number>(, fixes #<issue_number>, ...) format, will close the issue(s) when PR gets merged):
Fixes #334

Special notes for your reviewer:

1. Please confirm that if this PR changes any image versions, then that's the sole change this PR makes.

Release note:

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This change is 

[gaocegege]

/assign @johnugeorge

Not sure if we should merge it before 0.7

It requires some change to kf/manifests, I think.

[johnugeorge]

This would help users right?. In that case, shall we add to kf/manifests too?

[gaocegege]

It will be helpful. But there may be a blocker that we cannot upgrade from 8.0.3 to 8(8.0.17) painlessly. I need to delete /tmp/katib to clean the directory first.

[gaocegege]

But I think it works for us since it solves #334

[johnugeorge]

@gaocegege are you talking backward compatibility ? It is not compatible now anyways

[gaocegege]

@johnugeorge Yeah, then I think we can merge it into kf/manifests.

[johnugeorge]

/lgtm

[johnugeorge]

I will wait for @hougangliu

[hougangliu]

/approve

[gaocegege]

/assign @hougangliu

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