command to check current user in lakectl

[ItamarYuran]

Closes #8313

Change Description

Added functionality to check the user currently configured in lakectl

Background

see https://github.com/treeverse/lakeFS/issues/8313

New Feature

The new command prints the user info. The info consists of user id, email (only in case exists) and user creation date

Testing Details

Added tests esti tests to check both cases of existing and non existing email

Additional info

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E2E Test Results - DynamoDB Local - Local Block Adapter

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E2E Test Results - Quickstart

[N-o-Z]

@ItamarYuran @arielshaqed why is this a top level command? Why not put it under auth?