Added functionality in show_gpus to have an option to show all regions' pricing for an accelerator

[vaibagra]

This solves #2863

show_gpus can now accept a new flag --all-regions, which displays all the regions for a given accelerator. It can be used as follows.

sky show-gpus <acclerator> --all-regions

Additionally it can take a cloud argument as well.

sky show-gpus <acclerator> --cloud <cloud> --all-regions

I compared the outputs against the catalog.

Tested (run the relevant ones):

• Code formatting: bash format.sh
• Checking all regions exist.

[romilbhardwaj]

Thanks @Vaibhav2001! Seems to work nicely. Left some comments.

[romilbhardwaj]

Thanks @Vaibhav2001! Tested with clouds + a Kubernetes T4 cluster, seems to be working well. LGTM.

[concretevitamin]

Awesome work @Vaibhav2001.

For the same gpu:count, it may be good to sort by (HOURLY_PRICE, HOURLY_SPOT_PRICE, REGION). The current behavior appears to be sorting by REGION.

» sky show-gpus --all-regions A100 --cloud gcp
*NOTE*: for most GCP accelerators, INSTANCE_TYPE == (attachable) means the host VM's cost is not included.

GPU   QTY  CLOUD  INSTANCE_TYPE   DEVICE_MEM  vCPUs  HOST_MEM  HOURLY_PRICE  HOURLY_SPOT_PRICE  REGION
A100  1    GCP    a2-highgpu-1g   -           12     85GB      $ 3.841       $ 1.536            asia-northeast1
A100  1    GCP    a2-highgpu-1g   -           12     85GB      $ 3.841       $ 1.536            asia-northeast3
A100  1    GCP    a2-highgpu-1g   -           12     85GB      $ 3.841       $ 1.536            asia-southeast1
A100  1    GCP    a2-highgpu-1g   -           12     85GB      $ 3.673       $ 1.176            europe-west4
A100  1    GCP    a2-highgpu-1g   -           12     85GB      $ 3.967       $ 1.587            me-west1
A100  1    GCP    a2-highgpu-1g   -           12     85GB      $ 3.673       $ 1.469            us-central1
A100  1    GCP    a2-highgpu-1g   -           12     85GB      $ 3.673       $ 1.469            us-east1
A100  1    GCP    a2-highgpu-1g   -           12     85GB      $ 3.673       $ 1.469            us-west1
A100  1    GCP    a2-highgpu-1g   -           12     85GB      $ 4.176       $ 1.670            us-west3
A100  1    GCP    a2-highgpu-1g   -           12     85GB      $ 3.841       $ 1.536            us-west4