Add get user grants (MSSP aware) sample

[jshcodes]

Get User Grants (Sample)

This sample demonstrates using the UserManagement Service Class to retrieve all user grants within the tenant asynchronously. This solution also demonstrates the following FalconPy functionality:

• Debug logging
• Parent (MSSP) authentication
• Pythonic response handling

• Documentation
• Code sample

Unit test coverage

COVERAGE TESTING NOT REQUIRED FOR SAMPLE SUBMISSIONS

Bandit analysis

[main]	INFO	running on Python 3.9.17

Run started:2023-11-14 20:37:25.979083

Test results:
	No issues identified.

Code scanned:
	Total lines of code: 155
	Total lines skipped (#nosec): 0

Run metrics:
	Total issues (by severity):
		Undefined: 0
		Low: 0
		Medium: 0
		High: 0
	Total issues (by confidence):
		Undefined: 0
		Low: 0
		Medium: 0
		High: 0
Files skipped (0):

Added features and functionality

• Added: Get User Grants sample - retrieve all user grants within the tenant