feat/fix: simplify configuration for forest-cli

[lemmih]

Summary of changes

Changes introduced in this pull request:

• Remove the Config and Client structures from the forest-cli command-line handling.
• Add --expire-in flags to forest-cli auth create-token and forest-cli auth api-info commands.
• Move finality out of the client. The node is responsible for correctness.

Reference issue to close (if applicable)

Closes

Other information and links

Change checklist

• I have performed a self-review of my own code,
• I have made corresponding changes to the documentation,
• I have added tests that prove my fix is effective or that my feature works (if possible),
• I have made sure the CHANGELOG is up-to-date. All user-facing changes should be reflected in this document.