Remove deprecated errors package

[SuperQ]

The github.com/pkg/errors errors package is deprecated and the project is archived. Replace use with Go standard library errors and fmt versions.

• Make k8s.io errors package aliases consistent.

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[SuperQ]

This is going to take some work to refactor a few tests.

[haorenfsa]

@SuperQ Oh, wait. Let's first discuss about it before making these changes.

I don't think fmt.Errorf could replace github.com/pkg/errors.Wrap. It lacks the call stack trace, which is crucial under most circumstances.

[SuperQ]

It doesn't exactly, but the Go developers have decided against errors.Wrap(). The package is archived and receiving no support.

The new stdlib errors packages needs to be used.

[haorenfsa]

@SuperQ We feel that the standard library is still not enough. Let's use this library as milvus repo does https://github.com/cockroachdb/errors. This way the API is also compatible.

[SuperQ]

I'll leave that up to other people if they're interested.