Feat(tools): Add a tool to generate a custom genesis file based on a template and existing chain data

[dloghin]

Description

Adding a tool to bin/tools crate to allow the creation of a genesis file starting from a template genesis file and existing chain data. This is useful when we want to run a local devnet with XLayer testnet or mainnet data (e.g., from a snapshot).

The tool can be used as follows:

just install-tools
xlayer-reth-tools gen-genesis --datadir <path-to-existing-xlayer-reth-datadir> --chain xlayer-testnet --template-genesis ./config-op/genesis.json --output ./config-op/genesis-reth.json

We can also run this via Docker, by creating the xlayer-reth-tools image:

just build-docker-tools

Type of Change

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• Documentation update
• Refactoring (no functional changes)
• Other (please describe):

Code Guidelines

Before submitting your PR, please review the relevant code guidelines in the docs/ folder:

• Building on Reth Guide - Comprehensive guide for building on top of Reth

Specific Guidelines by Component:

• Chainspec & EVM Guide - For changes to chainspec or EVM configuration
• Database Guide - For changes to database tables or storage
• Engine & Consensus Guide - For changes to consensus or engine API
• Extension Guide - For adding extensions or plugins
• Node Builder Guide - For changes to node initialization
• Payload Builder Guide - For changes to block building logic

Checklist

• I have reviewed the relevant code guidelines in the docs/ folder
• My code follows the coding standards of this project
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have added tests that prove my fix is effective or that my feature works
• New and existing unit tests pass locally with my changes

Testing

Additional Notes