Support chain alias for subnet creation (in `install-subnet-chain` sub-command)

[gyuho]

https://docs.avax.network/apis/avalanchego/apis/admin#adminaliaschain

[gyuho]

The install-subnet-chain sub-command should have an optional flag to alias the newly created blockchain.

e.g.,

http://aops-custom-202305-2crvsg-nlb-1d600174371701f9.elb.ap-northeast-2.amazonaws.com:9650/ext/bc/XpX1yGquejU5cma1qERzkHKDh4fsPKs4NttnS1tErigPzugx5/rpc

can be

http://aops-custom-202305-2crvsg-nlb-1d600174371701f9.elb.ap-northeast-2.amazonaws.com:9650/ext/bc/v1/rpc

[exdx]

Looking into this now. Looking at the API it seems like the admin.aliasChain endpoint allows aliasing an existing chain. When issuing the createChainTx it seems like there is a place for chainName. Which seems like the ability to alias the chain name right when creating it.

So there are two options:

• Create the chain first, then call the alias endpoint
• Create the chain with the provided alias already intact

It seems like 1 is the best option but just wanted to confirm?
Since there is a way to provide the name to the chain initially, I think the aliasing can be done in a separate step.