Increase start timeout

[matuskosut]

Proposed change

Increase start timeout from default 5s to higher value, or at least allow to override using ENV variable.

If I am correct this might be affected https://jupyter-server-proxy.readthedocs.io/en/latest/server-process.html#timeout

Alternative options

Who would use this feature?

it would help those who experience timeout error due to slow start of rsession

(Optional): Suggest a solution

small draft how this could work, including environment variable that could be used to override default timeout:

    default_timeout = 15
    try:
        timeout = int(os.getenv('RSESSION_TIMEOUT', default_timeout))
    except Exception:
        timeout = default_timeout
    return {
        'command': _get_cmd,
        'timeout': timeout,
        'environment': _get_env,
        'launcher_entry': {
            'title': 'RStudio',
            'icon_path': get_icon_path()
        }
    }

something like this should then be add in these parts:

• https://github.com/jupyterhub/jupyter-rsession-proxy/blob/master/jupyter_rsession_proxy/__init__.py#L101-L109
• https://github.com/jupyterhub/jupyter-rsession-proxy/blob/master/jupyter_rsession_proxy/__init__.py#L143-L150

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