expose add-temporary-group-member command in zms-cli

[havetisyan]

Description

Contribution Checklist:

• The pull request does not introduce any breaking changes
• I have read the contribution guidelines.
• Create an issue and link to the pull request.

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[gemini-code-assist]

Summary of Changes

Hello @havetisyan, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request enhances the zms-cli tool by introducing a new command that facilitates the management of temporary group memberships. This feature allows administrators to grant time-limited access to users or services within groups, improving security and compliance by ensuring access is automatically revoked after a specified period. The changes involve updating the command-line interface to recognize and process the new command, as well as implementing the underlying logic to handle the expiration dates for group members.

Highlights

• New Command Introduced: A new command, add-temporary-group-member, has been added to the zms-cli tool, allowing users to add group members with a specified expiration date.
• Expiration Date Support: The new command supports an expiration parameter, which is a timestamp in yyyy-mm-ddThh:mm:ss.msecZ format, to define the duration of the temporary membership.
• Core Logic for Temporary Members: A new function, AddDueDateGroupMember, has been implemented in group.go to handle the creation and persistence of group memberships with due dates.
• CLI Help and Documentation Updates: The zms-cli help messages and command listings have been updated to include the syntax, parameters, and examples for the new add-temporary-group-member command.

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[gemini-code-assist]

Code Review

This pull request introduces the add-temporary-group-member command to zms-cli, allowing users to add members to a group with an expiration date. The changes are well-structured, including the new command logic, a corresponding function in group.go, and updates to the help documentation. I've provided two suggestions to enhance code readability and conciseness by following common Go idioms.