add start script and state sync script

statesync.bash

@@ -0,0 +1,58 @@
+#!/bin/bash
+# microtick and bitcanna contributed significantly here.
+# Pebbledb state sync script.
+# invoke like: bash statesync.bash
+
+## USAGE RUNDOWN
+# Not for use on live nodes
+# For use when testing.
+# Assumes that ~/.evmosd doesn't exist
+# can be modified to suit your purposes if ~/.evmosd does already exist
+
+set -uxe
+
+# Set Golang environment variables.
+export GOPATH=~/go
+export PATH=$PATH:~/go/bin
+
+# Install with pebbledb
+go mod edit -replace github.com/tendermint/tm-db=github.com/baabeetaa/tm-db@pebble
+go mod tidy
+make build
+
+# Install with goleveldb
+# go install ./...
+
+# NOTE: ABOVE YOU CAN USE ALTERNATIVE DATABASES, HERE ARE THE EXACT COMMANDS
+# go install -ldflags '-w -s -X github.com/cosmos/cosmos-sdk/types.DBBackend=rocksdb' -tags rocksdb ./...
+# go install -ldflags '-w -s -X github.com/cosmos/cosmos-sdk/types.DBBackend=badgerdb' -tags badgerdb ./...
+# go install -ldflags '-w -s -X github.com/cosmos/cosmos-sdk/types.DBBackend=boltdb' -tags boltdb ./...
+
+# Initialize chain.
+babylond init test
+
+# Get Genesis
+curl http://node.mainnet.babylonchain.io:26657/genesis | jq .result.genesis >~/.babylond/config/genesis.json
+
+# Get "trust_hash" and "trust_height".
+INTERVAL=100
+LATEST_HEIGHT=$(curl -s http://node.mainnet.babylonchain.io:26657/block | jq -r .result.block.header.height)
+BLOCK_HEIGHT=$(($LATEST_HEIGHT - $INTERVAL))
+TRUST_HASH=$(curl -s "http://node.mainnet.babylonchain.io:26657/block?height=$BLOCK_HEIGHT" | jq -r .result.block_id.hash)
+
+# Print out block and transaction hash from which to sync state.
+echo "trust_height: $BLOCK_HEIGHT"
+echo "trust_hash: $TRUST_HASH"
+
+# Export state sync variables.
+export BABYLOND_STATESYNC_ENABLE=true
+export BABYLOND_P2P_MAX_NUM_OUTBOUND_PEERS=200
+export BABYLOND_STATESYNC_RPC_SERVERS="http://node.mainnet.babylonchain.io:26657,http://node.mainnet.babylonchain.io:26657"
+export BABYLOND_STATESYNC_TRUST_HEIGHT=$BLOCK_HEIGHT
+export BABYLOND_STATESYNC_TRUST_HASH=$TRUST_HASH
+
+# Fetch and set list of seeds from chain registry.
+export BABYLOND_P2P_PERSISTENT_PEERS=c12226489ac3f6ce1d7903d37cd204bc8f269018@node.mainnet.babylonchain.io:26656
+
+# Start chain.
+babylond start --x-crisis-skip-assert-invariants