feat: prepare versioner to be exported as package

[alxdca]

Summary

• package the Orbit versioner for distribution instead of exposing it only as a Hardhat-run script
• remove the versioner’s Hardhat runtime dependency by switching it to direct ethers JSON-RPC usage
• add a package build/prepack flow and publish the versioner entrypoint plus generated typings
• document env-based CLI usage in the README

Why / Context

• consumers need to run the Orbit versioner outside the Hardhat runtime
• the versioner now accepts INBOX_ADDRESS and PARENT_CHAIN_RPC directly, which makes it usable as a
  packaged runtime entrypoint
• removing Hardhat from the versioner execution path reduces coupling to the repo toolchain while
  preserving the existing contract-version lookup behavior
• packaging requires emitted declarations/runtime files and updated publish metadata so downstream users
  can import the versioner cleanly

Risks / Notes

• the branch is currently 1 commit ahead of main and 7 commits behind origin/main
• no additional validation was run while preparing this PR draft

Test Plan

• run yarn build:package
• run yarn orbit:contracts:version --help
• run the versioner against a real INBOX_ADDRESS and PARENT_CHAIN_RPC