Remove interop genesis service from beacon node (#14417)

* Remove interop dependencies from production binary for beacon-chain. Specifically, remove the interop genesis service.

Finding links to pebble: 
bazel query 'somepath(//cmd/beacon-chain, @com_github_cockroachdb_pebble//...)' --notool_deps

* Update INTEROP.md

* Remove interop config

* Remove ancient interop script

* Add electra support for premine genesis

* Add example of --chain-config-file, test interop instructions

* Fixes

* Add binary size reduction

* Update binary size reduction

* Fix duplicate switch case

* Move CHANGELOG entries to unreleased section

* gofmt

* fix

hack/interop_start.sh

@@ -1,104 +0,0 @@
-#!/bin/bash
-
-"""
-2019/09/08 -- Interop start script.
-This script is intended for dockerfile deployment for interop testing.
-This script is fragile and subject to break as flags change.
-Use at your own risk!
-
-
-Use with interop.Dockerfile from the workspace root:
-
-docker build -f interop.Dockerfile .
-"""
-
-# Flags
-IDENTITY="" # P2P private key
-PEERS="" # Comma separated list of peers
-GEN_STATE="" # filepath to ssz encoded state.
-PORT="8000" # port to serve p2p traffic
-RPCPORT="8001" # port to serve rpc traffic
-YAML_KEY_FILE="" # Path to yaml keyfile as defined here: https://github.com/ethereum/eth2.0-pm/tree/master/interop/mocked_start
-
-# Constants
-BEACON_LOG_FILE="/tmp/beacon.log"
-VALIDATOR_LOG_FILE="/tmp/validator.log"
-
-usage() {
-    echo "--identity=<identity>"
-    echo "--peer=<peer>"
-    echo "--num-validators=<number>"
-    echo "--gen-state=<file path>"
-    echo "--port=<port number>"
-    echo "--rpcport=<port number>"
-}
-
-while [ "$1" != "" ];
-do
-    PARAM=`echo $1 | awk -F= '{print $1}'`
-    VALUE=`echo $1 | sed 's/^[^=]*=//g'`
-
-    case $PARAM in
-        --identity)
-            IDENTITY=$VALUE
-            ;;
-        --peers)
-            [ -z "$PEERS" ] && PEERS+=","
-           PEERS+="$VALUE"
-            ;;
-        --validator-keys)
-            YAML_KEY_FILE=$VALUE
-            ;;
-        --gen-state)
-            GEN_STATE=$VALUE
-            ;;
-        --port)
-            PORT=$VALUE
-            ;;
-        --rpcport)
-            RPCPORT=$VALUE
-            ;;
-        --help)
-            usage
-            exit
-            ;;
-        *)
-            echo "ERROR: unknown parameter \"$PARAM\""
-            usage
-            exit 1
-            ;;
-    esac
-    shift
-done
-
-
-echo "Converting hex yaml keys to a format that Prysm understands"
-
-# Expect YAML keys in hex encoded format. Convert this into the format the validator already understands.
-./convert-keys $YAML_KEY_FILE /tmp/keys.json
-
-echo "Starting beacon chain and logging to $BEACON_LOG_FILE"
-
-echo -n "$IDENTITY" > /tmp/id.key
-
-
-
-BEACON_FLAGS="--bootstrap-node= \
-  --deposit-contract=0xD775140349E6A5D12524C6ccc3d6A1d4519D4029 \
-  --p2p-port=$PORT \
-  --http-port=$RPCPORT \
-  --peer=$PEERS \
-  --interop-genesis-state=$GEN_STATE \
-  --p2p-priv-key=/tmp/id.key \
-  --log-file=$BEACON_LOG_FILE"
-
-./beacon-chain $BEACON_FLAGS &
-
-echo "Starting validator client and logging to $VALIDATOR_LOG_FILE"
-
-VALIDATOR_FLAGS="--monitoring-port=9091 \
-  --unencrypted-keys /tmp/keys.json \
-  --log-file=$VALIDATOR_LOG_FILE
-
-./validator- $VALIDATOR_FLAGS &
-