Add support to store passwords and tokens in the OS Keyring

[notthatjesus]

Overview

This PR adds support to use OS default keyring instead of storing the passwords and tokens in files. The implementation is done with backwards compatibility as well as adding a migration path to move current passwords to the keyring.

Changes

• Adds a new package to manage the keyring to add/modify/delete entries
• Refactoring of both Oauth2 package and the model to support using the keyring
• Adds a new UI prompt to add/update passwords
• Adds commands to set and migrate passwords/tokens
• Updated configuration to use the keyring by default, fallback to file storage
• Updated documentation
• Added go-keyring as direct dependency

[notthatjesus]

This PR includes as well the update to the benchmark adding support for oauth accounts (#4) because I branched from that one.

[notthatjesus]

Moving it back to draft to simplify the changes