add blast example (#76)

* add blast example(unfinished)

* research and test

* add blast example

examples/blast/.env-sample

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+# This is a sample .env file for use in local development.
+
+# Duplicate this file as .env here
+
+# Your Private key
+
+DEVNET_PRIVKEY="0x your key here"
+
+# Hosted Aggregator Node (JSON-RPC Endpoint). This is Blast Testnet, can use any Blast chain
+
+L2RPC="https://sepolia.blast.io"
+
+# Ethereum RPC; i.e., for Sepolia https://sepolia.infura.io/v3/<your infura key>
+
+L1RPC=""
+
+# Blast chain name
+BLAST="BLASTTEST"
+
+# Ethereum chain name
+ETHEREUM="SEPOLIA"

examples/blast/.gitignore

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+.env

examples/blast/hardhat.config.js

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+require('@nomiclabs/hardhat-ethers');
+require('./scripts/syncL2Requests');
+require('./scripts/syncBatchRoot');
+require('./scripts/setValidator');
+require('./scripts/changeFeeParams');
+
+const BaseConfig = require('../../hardhat.base.config');
+
+module.exports = Object.assign({}, BaseConfig, {
+  paths: {
+    cache: '../../cache',
+    artifacts: '../../artifacts',
+  },
+});