feat(pluginsdk): Allow overriding proxy ports in deck dev-proxy

[dylanwatsonsoftware]

This PR adds the following environment variables to the deck dev-proxy:

• DEV_PROXY_HTTP_PORT
• DEV_PROXY_HTTPS_PORT

By default dev-proxy (used for deck and deck plugin development) runs on port 9000 and 9443.
Sometimes these ports are inappropriate or already in use, so we need the ability to configure them.

This follows the pattern of the existing DEV_PROXY_HOST env var and exposes an additional 2 env vars.

They can also be configured by adding fields into the package.json of the running project via:

{

    ...rest of the package.json

    "devProxy": {
        "httpPort": 9000,
        "httpsPort": 9443
    }
}

[spinnakerbot]

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• f8ca3f1: Allow DEV_PROXY_HTTP_PORT and DEV_PROXY_HTTPS_PORT env vars to override proxy ports

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[mattgogerly]

@Mergifyio update

[mergify]

update

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