Authentication via btp CLI

[lechnerc77]

This discussion should be used for exchange of the experimental feature to authenticate via the btp CLI and reuse the session to authenticate when using Terraform.

This feature will be provided as an experimental feature in an upcoming release (planned for 1.22.0) and originates from the feature request #1452.
It is intended to be used for local execution of Terraform, for the usage in a CI/CD pipeline we recommend using one of the already existing authentication mechanisms, and do not plan to support the feature in CI/CD pipelines.

This discussion will be updated, once the feature is available.