feat: add Mawari Testnet Network(576)

[Jay9997]

Chain Details
Chain ID: 576
Name: Mawari Network Testnet
Short Name: Mawari Network Testnet
Native Currency: MAWARI (18 decimals)
RPC: https://rpc.testnet.mawari.net/http
Explorer: (EIP3091)](https://explorer.testnet.mawari.net/)
Info: https://www.mawari.net/

Files Added
_data/chains/eip155-476.json

[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.