Add multi gpus feature

[nvdamien]

Related to #258

Comfyui-cli uses a config file config.ini to save and check if a Comfyui server was started:

[DEFAULT]
enable_tracking = False
recent_workspace = /home/user/Documents/comfyui/ComfyUI
background = ('127.0.0.1', '8188', 1131305)

A new command line flag ("--name") was added to the "launch" and "stop" command. When "--name" is added, this is adding a new section into the config.ini.

For example:

comfy --launch --name GPU_0 -- --port 8188 --cuda-device 0
comfy --launch --name GPU_1 -- --port 8288 --cuda-device 1

Will give in the config.ini:

[DEFAULT]
enable_tracking = False
recent_workspace = /home/user/Documents/comfyui/ComfyUI

[GPU_0]
background = ('127.0.0.1', '8188', 1131305)

[GPU_1]
background = ('127.0.0.1', '8288', 1132502)

From here, we can stop a server using the same --name flag:

comfy stop --name GPU_0

Will stop the server GPU_0 and remove the session GPU_0 from the config.ini

This feature let us starts multiple servers on the same machine that has multiple GPUs.

[codecov]

Codecov Report

Attention: Patch coverage is 38.80597% with 41 lines in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
comfy_cli/config_manager.py	45.00%	22 Missing ⚠️
comfy_cli/command/launch.py	23.07%	10 Missing ⚠️
comfy_cli/cmdline.py	37.50%	5 Missing ⚠️
comfy_cli/command/run.py	20.00%	4 Missing ⚠️

Flag	Coverage Δ
unittests	44.66% <38.80%> (-0.12%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

Files with missing lines	Coverage Δ
comfy_cli/constants.py	100.00% <100.00%> (ø)
comfy_cli/command/run.py	17.22% <20.00%> (+0.06%)	⬆️
comfy_cli/cmdline.py	47.47% <37.50%> (-0.38%)	⬇️
comfy_cli/command/launch.py	17.55% <23.07%> (+0.09%)	⬆️
comfy_cli/config_manager.py	52.22% <45.00%> (-2.58%)	⬇️

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