client/http: support tidb-operator SDK

[HuSharp]

What problem does this PR solve?

Issue Number: Ref #7300

What is changed and how does it work?

Check List

Tests

• Unit test
• Integration test
• Manual test (add detailed scripts or steps below)
• No code

Release note

None.

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[nolouch]

It's better to group the Interface by severity. some interfaces are only used in operators and it's critical. Once user use this function, should let the user know it's critical when using that. like the group the op interface to the MaintianceOpClient etc.

[ti-chi-bot]

PR needs rebase.

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