factored out make_rest_server_debug/prod

[zyxue]

The idea is to factor parts out of main to make it more modular and readable.

If this PR works out. will factor out _make_rest_metrics_server and _make_grpc_server next.

Running make test locally seems flaky, even on master.

[seldondev]

Hi @zyxue. Thanks for your PR.

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[axsaucedo]

In regards to the comment of flaky make test, we've been aware of the flakiness for a while - if you get a chacne to have a look that would actually also be of huge help for the project

/test integration

[axsaucedo]

Integration tests pass, can merge once the updates above are carried out

[zyxue]

@axsaucedo , mind take another look, please?

[axsaucedo]

Thank you very much for the contribution @zyxue

/approve

[seldondev]

[APPROVALNOTIFIER] This PR is APPROVED

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