Enables Support for tracking Orb Releaes in CircleCI Releases

[james-crowley]

The changes below add support for CircleCI's Releases. This addition adds an optional parameter to the publish job called release_environment. If release_environment is set, upon releasing a new version of the orb the release itself will be tracked in the supplied environment.

Note users will need to make a custom environment type in CircleCI Releases and then pass that environment name as the parameter.

By default release_environment is set to an empty string, which will skip over the release tracking. This should not break any usage of the existing orb tools.

[james-crowley]

@david-montano-circleci This PR is blocked until #236 is merged. The version of the CircleCI is too old to run the release command.

Which result in an error like:

Error: unknown command "run" for "circleci"

Did you mean this?
        runner

Run 'circleci --help' for usage.

Exited with code exit status 255

[james-crowley]

I updated the PR to avoid cli confusion between circleci and circleci-agent. The PR no longer requires merging of #236