Setup plugin

[ADorigi]

Description

This pull request sets up a bare minimum working plugin. The plugin firstly authenticates to your GCP account using gcloud's configuration(more about ADC). It then fetches your instances for the current active project in gcloud. Next, I am trying to configure it to display these instances for the kaytu command kaytu optimize compute-instances. It is still a major work in progress but I would like to understand if my approach is correct.

Steps to test:

• ensure gcloud is configured, as updated in this repository's Readme.
• install the gcp plugin in debug mode on kaytu cli

go run main.go plugin install --plugin-debug-mode gcp --unsafe false 

• run the plugin in debug mode

make debug

Output

What type of PR(Pull Request) is this?

• 🍕 New Feature
• 📝 Documentation update
• ✅ Test
• 🤖 Build

Added to documentation?

• 📜 README.md

New Feature

1. Provide a clear explanation of your new feature.
2. Include relevant tests for the new feature.
3. Confirm successful local testing of your changes.
4. Update the relevant documentation (if applicable).