Add script based setup to join merge devnet

[g11tech]

Easy script to join the merge devnet(s)

This is a setup to run and join the devnet with a single shell command. This script will pull the appropriate images and config and spin up the EL client and lodestar.

Requirements

1. docker
2. git
3. A bash shell

Just run the script with arguments

cd kintsugi/devnets
./setup.sh --dataDir kintsugi-data --elClient geth --devnetVars ./kintsugi.vars [--dockerWithSudo --withTerminal "gnome-terminal --disable-factory --"]

Example scenarios

1. Run with separate terminals launched & attached (best for testing in local) :
   ./setup.sh --dataDir kintsugi-data --elClient nethermind --devnetVars ./kintsugi.vars --withTerminal "gnome-terminal --disable-factory --" --dockerWithSudo
2. Run in-terminal attached with logs interleaved (best for testing in remote shell) :
   ./setup.sh --dataDir kintsugi-data --elClient nethermind --devnetVars ./kintsugi.vars --dockerWithSudo
3. Run detached (best for leaving it to run, typically after testing 1 or 2):
   ./setup.sh --dataDir kintsugi-data --elClient nethermind --devnetVars ./kintsugi.vars --detached --dockerWithSudo

You can alternate between geth and nethermind to experiment with the ELs being out of sync ( and catching up) with lodestar.

Script parameters help

1. dataDir: Where you want the script and client's configuration data to be setup. Should be non-existent one for the first run. (The directory if already present will skip fetching the configuration, assuming it has done previously). You can also clean indivizual directories of CL/EL between the re-runs.
2. elClient: Which EL client you want, currently working with geth and nethermind
3. devnetVars: Contains the configuration specific to a devnet, like images, or urls for EL/CL to interact. Will be updated with new vars.
4. dockerWithSudo(optional): Provide this argument if your docker needs a sudo prefix
5. --withTerminal(optional): Provide the terminal command prefix for CL and EL processes to run in your favourite terminal.
   You may use an alias or a terminal launching script as long as it waits for the command it runs till ends and then closes.If not provided, it will launch the docker processes in in-terminal mode.
6. --detached(optional): By default the script will wait for processes and use user input (ctrl +c) to end the processes, however you can pass this option to skip this behavior and just return, for e.g. in case you just want to leave it running.

Only one of --withTerminal or --detached should be provided.

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[codecov]

Codecov Report

Merging #3514 (2703325) into master (20409fe) will not change coverage.
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