feat(json/styled output): adds config for output format and global cmd success handler to output based on config

[jakedoublev]

1. Adds a tructl.yaml config to drive things like global CLI output format
2. Adds global command tructl config output --format <'json' | 'styled'> that updates the config file
3. Maintains support for global command --json to output a single run of the CLI as json but not overwrite the config
4. Reads the --json and config for output format
5. Unifies success handling throughout all existing policy flows to print styled output or JSON as applicable

Closes #30

[jakedoublev]

Demo: https://www.loom.com/share/e3f9de4bee2f4e259c65fc6ae3b4b436?sid=eff8e84d-893d-4feb-a575-2693614aeca7