feature: add simple eth chain

[Anmol1696]

Add ability to have simple eth chain setup with Starship

[Anmol1696]

How best to expose the eth chain to the config file.
We have a couple of options:

Option 1:

chains:
- id: becon-chain-1337
  name: eth-becon-chain
  numValidators: 4  # number of nodes
  config:
  #  ... 
  balances: 
    - address: <eth addr>
      amount: 1000ETH
    # ...
- id: execution-chain
  name: eth-execution-chain
  image: prysm:stable
  numValidators: 4  # number of nodes for execution chain
- id: validator
  name: eth-validator
  numValidator: 4   # number of validators      

Each type of node has its own

Option 2:

chains:
- id: eth
  name: ethereum
  numValidators: 4
  config: 
    beaconChain:
      image:
    executionChain:
      image:
    validator:
      image:

In this case we will have a single stateful set with 3 containers, one for each type of node.
This way number of nodes or numValidators is just a replica of the same set of nodes.

Option 3:

Similar to 2, but we will have different stateful set for each of the chain.