Nffl demo examples (#265)

* Operator set update script

* State Root update script

* Add script to get storage value

* Integrate rlp package for encoding

* Add demo nffl cli tool

* Get private key from environment variable

* chore: Restructure nffl-cli directories

* refactor: Port CLI to TS

* docs: Add README to demo CLI

* feat: Add block-height arg to storage-proof

* feat: Add commands as npm scripts

* chore: Update ABI

---------

Co-authored-by: Franco Barpp Gomes <[email protected]>

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examples/nffl-cli/README.md

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+## How to build
+```sh
+npm install
+```
+
+## Commands
+
+### `storage-proof`
+
+Get the proof for a storage slot of a target contract from the source chain.
+
+```bash
+npm run storage-proof -- \
+ --rpc-url https://sepolia.optimism.io\
+ --contract-address 0xB90101779CC5EB84162f72A80e44307752b778b6\
+ --storage-key 0x0000000000000000000000000000000000000000000000000000000000000000\
+ --block-height 14095733
+```
+
+### `update-state-root`
+
+Update the state root for a given rollup in a SFFLRegistryRollup contract.
+
+```bash
+PRIVATE_KEY=<> npm run update-state-root -- \
+ --rpc-url https://sepolia-rollup.arbitrum.io/rpc\
+ --rollup-id 11155420\
+ --block-height 14095733\
+ --contract-address 0x23e252b4Ec7cDd3ED84f039EF53DEa494CE878E0\
+ --aggregator-url http://127.0.0.1:4002\
+```
+
+### `update-operator-set`
+
+Update the operator set for a given SFFLRegistryRollup contract.
+
+```bash
+PRIVATE_KEY=<> npm run update-operator-set -- \
+ --rpc-url https://sepolia-rollup.arbitrum.io/rpc\
+ --contract-address 0x23e252b4Ec7cDd3ED84f039EF53DEa494CE878E0\
+ --id 10\
+ --aggregator-url http://127.0.0.1:4002\
+```