Refactor the Status of Knowhere

[liliu-z]

Instead of throwing exception, Knowhere report error code out. But these error codes are not will designed:

1. Too many type and no clear instruction how to use them.
2. User doesn't know whether this error is retryable.

[github-actions]

This issue has been automatically marked as stale because it has not had recent activity. It will be closed if no further activity occurs. Thank you for your contributions. Rotten issues close after 30d of inactivity. Reopen the issue with /reopen.

[liliu-z]

/reopen

[sre-ci-robot]

@liliu-z: Reopened this issue.

In response to this:

/reopen

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[github-actions]

This issue has been automatically marked as stale because it has not had recent activity. It will be closed if no further activity occurs. Thank you for your contributions. Rotten issues close after 30d of inactivity. Reopen the issue with /reopen.