Shell Completions

[aj-stein-nist]

User Story:

As an engineer using oscal-cli, in order to make more effective use of the tool, I would like tab completions to work in bash and zsh-based Linux environments to tell me available commands and subcommands based on the context of any commands and arguments supplied.

Goals:

• Make the CLI tool easier to use.
• Compensate for excessive documentation with just-in-time completions that suffice for documentations on sensible command and argument pairing.

Dependencies:

N/A

Acceptance Criteria

• All website and readme documentation affected by the changes in this issue have been updated.
• A Pull Request (PR) is submitted that fully addresses the goals of this User Story. This issue is referenced in the PR.
• The CI-CD build process runs without any reported errors on the PR. This can be confirmed by reviewing that all checks have passed in the PR.