Help automate subnet chain installation

[gyuho]

From discussion with @patrick-ogrady

We need a way to expose these in a YAML file or automate everything...

Put chainID from subnet in YAML
Always update these fields
--s3-bucket avalanche-ops-202306-3rvckma2re-us-west-2 \
--s3-key-prefix aops-custom-202306-cLK1Rg/install-subnet-chain \
--chain-rpc-url http://54.189.92.220:9650 \
--key 0x56289e99c94b6912bfc12adc093c9b51124f0dc54ac7a766b2bc5ccf558d8027 \
--ssm-docs '{"us-west-2":"aops-custom-202306-cLK1Rg-ssm-install-subnet-chain"}' \
--target-nodes '{"...'

Script start of prometheus + spam script in dev-machine

VM binary path is already automatically done by hypersdk, but nice to automate.

c.f., ava-labs/hypersdk#205

[exdx]

@coffeeavax will look into this one