Wait for environment creation

[tharders]

For environment commands that create or reset the environment it should be possible to add a "wait" option, so that the command can be used in a pipeline where other commands follow that use the new environment.

The contentful CLI has such an option "await-processing" that simply repeats to get the environment:
https://github.com/contentful/contentful-cli/blob/master/lib/cmds/space_cmds/environment_cmds/create.js#L77

But I think the maximum wait time is too short in the Contentful implementation.
It would be good if you can also specify the maximum wait time.