Add Parallax mainnet (LAX)

[andrepatta]

This PR registers Parallax in ethereum-lists/chains.

Website: https://parallaxchain.org/
Explorer: https://explorer.parallaxchain.org/
Whitepaper: https://github.com/microstack-tech/parallax-whitepaper
CoinPaprika: https://coinpaprika.com/coin/lax-parallax/
X (Twitter): https://x.com/prlxchain

[github-actions]

You successfully submitted a PR! Due to the amount of PRs coming in: we will only look at PRs that the CI is happy with. We can also not hold your hand getting the CI green - just look how others that where merged did it and RTFM. So as long as there is any CI check that reports an error - no human will look at this. You might be able to ask for some support after supporting the project - e.g. by sending funds to lists.eth. When you fixed things after a requested change - then you also need to (re-)request a review.