feat: Change working directory

[hpohekar]

closes #2945

D:\pyfluent>python
Python 3.10.11 (tags/v3.10.11:7d4cc5a, Apr  5 2023, 00:38:17) [MSC v.1929 64 bit (AMD64)] on win32
Type "help", "copyright", "credits" or "license" for more information.
>>> from ansys.fluent.core import launch_fluent
>>> solver = launch_fluent()
>>> solver._app_utilities.get_controller_process_info()
{'hostname': 'AAPQ13pUvWxQtxN', 'process_id': 339960, 'working_directory': 'D:\\pyfluent'}
>>> solver._app_utilities.get_solver_process_info()     
{'hostname': 'AAPQ13pUvWxQtxN.win.ansys.com', 'process_id': 350440, 'working_directory': 'D:/pyfluent'}
>>> solver.chdir("D:\pyfluent\codegen")
>>> solver._app_utilities.get_controller_process_info()
{'hostname': 'AAPQ13pUvWxQtxN', 'process_id': 339960, 'working_directory': 'D:\\pyfluent\\codegen'}
>>> solver._app_utilities.get_solver_process_info()     
{'hostname': 'AAPQ13pUvWxQtxN.win.ansys.com', 'process_id': 350440, 'working_directory': 'D:/pyfluent/codegen'}
>>> solver.exit()