Make dev machine plugins more configurable/modular

[gyuho]

c.f., https://github.com/ava-labs/avalanche-ops/pull/376

ideally, we shouldn't hard-code plugin bootstrap script.

We can follow the pattern here: https://github.com/gyuho/aws-manager/blob/main/examples/ec2_plugins.rs

And do something like

        UserData:
          Fn::Base64:
            Fn::Sub: |
              #!/usr/bin/env bash

              # install aws cli
              while [ 1 ]; do
                sudo rm -f /tmp/awscli-exe-linux-$(uname -m).zip || true;
                sudo apt-get update -yq && sudo apt-get install -yq wget unzip && wget --quiet --retry-connrefused --waitretry=1 --read-timeout=20 --timeout=15 --tries=70 --directory-prefix=/tmp/ --continue https://awscli.amazonaws.com/awscli-exe-linux-$(uname -m).zip
                if [ $? = 0 ]; then break; fi; # check return value, break if successful (0)
                sleep 2s;
              done;
              unzip /tmp/awscli-exe-linux-$(uname -m).zip && sudo ./aws/install
              /usr/local/bin/aws --version

              AWS_RETRY_MODE=standard AWS_MAX_ATTEMPTS=7 aws s3 cp s3://${S3BucketName}/${Id}/init.bash /tmp/init.bash
              bash /tmp/init.bash