support nvgpu event

[winterddd]

Use nvml library to report nvgpu event. New environment NVGPU_EVENT_TYPES indicate registered events.
rasdaemon print like follow：

       <...>-0          [-01] .... 0.000000                       xid: xid: 43 pci_port: 00000000:00:03.0 gpu-i: 0 gpu-ci: 0 

[axiqia]

Explicitly add Python env:
#!/usr/bin/env python

[mchehab]

Please use:
#!/usr/bin/env python3

As some distributions don't provide a python -> python3 alias.

[axiqia]

add exception handling, e.g:

try:
with open(PATH, 'r') as file:
content = file.read()
except FileNotFoundError:
print(f"Error: File {PATH} not found.")
exit(1)
except IOError as e:
print(f"Error reading file {PATH}: {e}")
exit(1)

[axiqia]

Ensure thread cancellation is handled safely, Join with thread to see what its exit status was.
pthread_cancel(nvgpu_thread);
pthread_join(nvgpu_thread, NULL); // Wait for thread to terminate

[mchehab]

Patch breaks when cuda is not loaded:

File "rasdaemon/contrib/nvml.py", line 25, in
with open(PATH, 'r') as file:
~~~~^^^^^^^^^^^
FileNotFoundError: [Errno 2] No such file or directory: '/usr/local/cuda/include/nvml.h'
make: *** [Makefile:2108: ras-nvgpu-nvml.h] Error 1
make: *** Waiting for unfinished jobs....

Also:

• it assumes cuda to be under /usr/local, instead of letting configure discover its locations.
• for python, use 4 spaces for indentation, without tabs, as this is the most common standard.