feat: add a typescript version of generate.sh

[alxdca]

This PR is part of a stack created with Aviator. ci: add npm publish workflow #18 ➡️ feat: add a typescript version of generate.sh #15 main

Summary

• add a TypeScript generator entrypoint in generate.ts that validates required env vars, runs the Foundry script, merges optional
  custom alloc JSON, and rewrites serializedChainConfig deterministically before writing genesis/genesis.json
• add Node.js/pnpm tooling for the TypeScript workflow, including package.json, tsconfig.json, Prettier config, lockfile, and Node
  24 version pinning
• document the Node.js setup in README.md and ignore generated/dependency directories such as dist/ and node_modules/

Why / Context

• provide a maintained TypeScript-based workflow for generating genesis files alongside the existing shell-based process
• make the generator easier to run from standard Node.js tooling with explicit scripts and version requirements
• keep the generated chain config serialization stable after parsing and rewriting the output JSON

Test Plan

• pnpm install
• pnpm build
• pnpm prettier:check
• pnpm generate with a valid .env
• compare the generated genesis/genesis.json and follow-on blockhash/sendRoot flow against the existing ./generate.sh workflow

[TucksonDev]

Requesting changes based on the modifications of the Foundry files. I'd prefer if we hardcode the output path, but happy to discuss those changes if we need them.