feat(plugin-ai): Add 'ai:models:info' command

[eablack]

Description

This PR implements the ai:models:info command with tests according to the design outlined in the UX design doc.

How to test

Prepare your environment for testing

• Fetch this branch.
• Run yarn && yarn build.
• Set the HEROKU_INFERENCE_HOST to staging via export HEROKU_INFERENCE_HOST=staging.inference.herokai.com

Actual testing

1. Verify that help looks ok: ./bin/run ai:models:info --help
2. Create a test app that will be used to check provisioned model resources against via heroku apps:create test-cli-plugin-ai
3. Create a test model resource to later check more info about via heroku addons:create inference-staging:claude-3-sonnet -a test-cli-plugin-ai
4. Repeat step 3 so we can check multiple model resources for a single app
5. Check for more info about a single model resource via ./bin/run ai:models:info inference-staging:claude-3-sonnet -a test-cli-plugin-ai The resulting output should display as follows:

Avg Performance: Feature to be implemented
Ready:           Feature to be implemented
Tokens In:       Feature to be implemented
Tokens Out:      Feature to be implemented

6. Check for more info about all model resources on a single app via ./bin/run ai:models:info -a test-cli-plugin-ai The resulting output should display as follows:

Avg Performance: Feature to be implemented
Ready:           Feature to be implemented
Tokens In:       Feature to be implemented
Tokens Out:      Feature to be implemented

Avg Performance: Feature to be implemented
Ready:           Feature to be implemented
Tokens In:       Feature to be implemented
Tokens Out:      Feature to be implemented

Test clean up

• Destroy test app via heroku apps:destroy -a test-cli-plugin-ai (x2 as you will have 2 model resource attachments)
• Unset HEROKU_INFERENCE_HOST via unset HEROKU_INFERENCE_HOST

SOC2 Compliance

GUS Work Item

[sbosio]

A couple comments. It seems that copies don't align with the latest approved ones, maybe you were following the API design doc, but we should be following this one instead: https://docs.google.com/document/d/1Fo4M5RqbHQILYYmHKty13QGS8hqK1A69swGczJiuDyg/edit#heading=h.2saci73qrjpz.

[sbosio]

Looks great! I tested and it works as a charm. I suggest adding a header when multiple model resources are returned to differentiate one from another, but that's all. I'm approving.