Create and manage Azure Pipelines from the command line

Introduced the `az pipelines` command group in the Azure DevOps extension for the Azure CLI, enabling users to create, delete, list, run, show, and update YAML-backed Azure Pipelines from the command line. It provides an interactive flow for pipeline creation and the ability to automate the process by referencing a YAML file. Additionally, it covers managing pipeline runs, artifacts, and tags using `az pipelines runs` commands.