Refine temporary configuation related http API

## Development Task

#3082 and #3131 add support to set some configuation temporarily, currently these temporary configuation only works internally and won't show in our http api, which may cause confusion when debugging.
And when the user try to set an unsupported temporarily configuation via http API, no error will be returned to warn the user, this may also cause some problem.

So we should:
- Show the temporary value on our http api when a temporary configuation is set.
- Return an http error when the user try to set an unsupported temporarily configuation