Bug: Add defer recover for all go routines to prevent abnormal crash of manager-api

[gxthrj]

Please answer these questions before submitting your issue.

• Why do you submit this issue?
• Question or discussion
• Bug
• Requirements
• Feature or performance improvement
• Other

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Bug

• Which version of Apache APISIX Dashboard, OS, and Browser?
  2.0

• What happened?
  Manager-api may crash without any logs.
  In gin, we use filter.RecoverHandler() to prevent crash.
  But we can not control the exceptions in other go-routines.
  Need to add defer recover() for all go routines to prevent abnormal crash of manager-api .

[tokers]

We may use https://github.com/kubernetes/apimachinery/blob/master/pkg/util/runtime/runtime.go#L45 to handle it.

[juzhiyuan]

Any update for this issue?

[gxthrj]

cc @nic-chen @starsz what do you think about this

[starsz]

cc @nic-chen @starsz what do you think about this

Agree +1. But what should we do if we catch the other goroutine panic?

[nic-chen]

cc @nic-chen @starsz what do you think about this

sure, agree +1