Add support for Pactus Blockchain

[Ja7ad]

Description

Pactus is an open source, layer-1 blockchain technology with a revolutionary, secure, Solid State Proof of Stake Consensus.

Name: Pactus
HD Derivation Scheme: m/44'/21888'/3'/0'
Symbol: PAC
Documentation: https://docs.pactus.org
Reason:

Checklist

Finish check list here.

[Milerius]

Hey, we will review the pull request, please ack the following disclaimer from the readme:

The Wallet Core project is led and managed by Trust Wallet with a large contributor community and actively used in several projects. Our goal at Wallet Core is to give other wallets an easy way to add chain support.

Trust Wallet products leverage wallet core, however, they may or may not leverage all the capabilities, features, and assets available in wallet core due to their own product requirements.