feat: updates slack user service 🚚

[omar-elbaz]

Description ✏️

Updates Slack User Service with two new functions. GetAllUsers and GetUserProfile

Related to #2

• Implement two new functions in the slack-user.service file which call the slack api to:
• Get All Users in the ColorStack Family Workspace
• Fetch each user's individual User Profile

These will be needed in order to migrate birthdates from Slack to the ColorStack Member Profile Database, and will also be beneficial in the future when accessing Slack users.

Type of Change 🐞

• Feature - A non-breaking change which adds functionality.
• Fix - A non-breaking change which fixes an issue.
• Refactor - A change that neither fixes a bug nor adds a feature.
• Documentation - A change only to in-code or markdown documentation.
• Tests - A change that adds missing unit/integration tests.
• Chore - A change that is likely none of the above.

Checklist ✅

• I have done a self-review of my code.
• I have manually tested my code (if applicable).
• I have added/updated any relevant documentation (if applicable).