feat: Add fcli fod app list-users command to list users assigned to an application

[SangameshV]

This PR introduces a new command, fcli fod app list-users (alias: lsu), to retrieve and display users assigned to a given FoD application. This merge resolves #1008.

Currently, FCLI provides commands to list and manage applications but lacks visibility into user assignments for a specific application. This enhancement improves usability by enabling users to easily view application-level user access directly from the CLI.

Displays user details including:

• Id
• First Name
• Last Name
• Email
• Role

Usage Example
fcli fod app lsu --app <appNameOrId>

Sample Output

Id	First Name	Last Name	Email	Role
123	John	Doe	john.doe@test.com	Developer
456	Jane	Smith	jane.smith@test.com	Manager

Impact

• Enhances FoD application management capabilities
• Provides better visibility into user assignments
• Enables easier auditing and troubleshooting of access control

Testing

• Verified command help output (fcli fod app -h) includes list-users
• Validated user listing for existing applications
• Tested alias (lsu) functionality
• Confirmed output formatting and data accuracy

Notes

• This change is fully backwards-compatible
• No impact on existing commands