Metax GPU topo-awareness support

[archlitchi]

Support metax GPU topo-awareness

1. Add utility of topo-awareness of metax GPU
2. Add examples in examples/metax folder
3. Add documents of metax devices

[codecov[bot]]

Codecov Report

Attention: Patch coverage is 32.14286% with 95 lines in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
pkg/device/metax/device.go	28.43%	73 Missing :warning:
pkg/scheduler/policy/node_policy.go	66.66%	3 Missing and 1 partial :warning:
pkg/scheduler/scheduler.go	25.00%	3 Missing :warning:
pkg/device/ascend/device.go	0.00%	2 Missing :warning:
pkg/device/cambricon/device.go	0.00%	2 Missing :warning:
pkg/device/hygon/device.go	0.00%	2 Missing :warning:
pkg/device/iluvatar/device.go	0.00%	2 Missing :warning:
pkg/device/mthreads/device.go	0.00%	2 Missing :warning:
pkg/device/nvidia/device.go	0.00%	2 Missing :warning:
pkg/util/types.go	0.00%	2 Missing :warning:
... and 1 more

Flag	Coverage Δ
unittests	27.03% <32.14%> (+0.01%)	:arrow_up:

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

Files with missing lines	Coverage Δ
pkg/scheduler/nodes.go	67.85% <ø> (ø)
pkg/scheduler/policy/gpu_policy.go	83.87% <100.00%> (ø)
pkg/scheduler/score.go	67.24% <100.00%> (+0.18%)	:arrow_up:
pkg/device/devices.go	25.71% <75.00%> (-1.43%)	:arrow_down:
pkg/device/ascend/device.go	2.89% <0.00%> (-0.04%)	:arrow_down:
pkg/device/cambricon/device.go	13.30% <0.00%> (-0.14%)	:arrow_down:
pkg/device/hygon/device.go	14.96% <0.00%> (+1.17%)	:arrow_up:
pkg/device/iluvatar/device.go	29.41% <0.00%> (-0.44%)	:arrow_down:
pkg/device/mthreads/device.go	14.28% <0.00%> (-0.18%)	:arrow_down:
pkg/device/nvidia/device.go	31.27% <0.00%> (-0.30%)	:arrow_down:
... and 4 more

... and 1 file with indirect coverage changes

[archlitchi]

/approve