Migrate CLI configuration to hoplite

[tagantroy]

Migrate CLI configuration to Hoplite It supports data/sealed classes, optional values, tuples and etc. link Supported formats: yaml, toml, json and etc. It also support env variables in yaml.

[sphanley]

Asking this with nothing but appreciation for the hard work of the team here: anything you're able to share in terms of an ETA for this feature? My team is working on adding capabilities to our testing design where this would be hugely beneficial (around the ability to dynamically specify subsets of tests to execute), and knowing roughly how soon this is expected would make a big difference in terms of the work we decide to do in that area in the meantime.