Make the use of system keychain optional

[epierce]

Description

Added a new config option (enable_keychain) and CLI parameter (--disable-keychain). enable_keychain defaults to TRUE so that existing behavior is not affected. If --disable-keychain is used or enable_keychain = False, the system keychain will not be used and the user will always be prompted for their password.

Related Issue

#212

Motivation and Context

Some organizations may want to avoid the storage of user credentials and force the user to input their password on every use.

How Has This Been Tested?

tested on macOS 13.6 with Python 3.11.6

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)

Checklist:

• My code follows the code style of this project.
• My change requires a change to the documentation.
• I have updated the documentation accordingly.
• I have read the CONTRIBUTING document.
• I have added tests to cover my changes.
• All new and existing tests passed.