Expose Cloud API endpoints as commands

[cdhunt]

What problem does this feature solve?:

It would be convenient if the CLI expose some more API methods using information like the git repo and known credentials to populate the API parameters.

Provide an example:

Example

Get your pipelines.

$ circleci pipeline list

project_slug                        number state   created_at           updated_at
gh/CircleCI-Public/api-preview-docs 0      created 8/24/2019 2:15:22 PM 8/24/2019 2:15:22 PM

Example

Approve workflow

$ circleci workflow approve --id 497f6eca-6276-4993-bfeb-53cbbbba6f08

Example

Get recent workflow runs

$ circleci runs list

branch duration created_at           stopped_at           credits_used status
main 0          8/24/2019 2:15:22 PM 8/24/2019 2:15:22 PM 0            success

The GitHub CLI does an excellent job of making their API easier to consume for simple automation tasks.