Add Polymesh as a supported chain

[adamdossa]

Adding a new chain to the Explorer
To get a new chain added to the Explorer, you will need to submit the following:

1. JSON-RPC spec for Wallets (only if one doesn't already exist). For more information, please review the Ethereum JSON-RPC API docs.

Polymesh is a solo-chain based on the Substrate framework. As such it supports the usual polkadot methods:
https://docs.walletconnect.com/advanced/multichain/polkadot/dapp-integration-guide
polkadot_signTransaction and polkadot_signMessage

GitHub Link:
https://github.com/PolymeshAssociation/polymesh

2. Write a CASA namespace spec if not already available for this namespace.
   GitHub Link:

The CASA namespace spec proposed for polkadot covers all chains that implement the Polkadot Host Runtime, so Polymesh is already included:
https://github.com/ChainAgnostic/namespaces/blob/main/polkadot/README.md

4. namespaces:
   *known chain namespaces (e.g. eip:155 for Ethereum/EVM-based chains, solana, ...)
5. chains:
   *known chains, where the primary key is a compound key composed of namespace + reference (e.g. ETH mainnet is eip155:1).
   Please provide labels for each chain (e.g. mainnet, testnet, devnet, ...)

Polymesh Mainnet - polkadot:6fbd74e5e1d0a61d52ccfe9d4adaed16
Polymesh Testnet - polkadot:2ace05e703aa50b48c0ccccfc8b424f7

6. RPC endpoints
   *list of common/canonical RPC endpoints for the chain(s)

wss://mainnet-rpc.polymesh.network
wss://testnet-rpc.polymesh.live

7. SLIP-0044 coin type:
   * slip44 coin type used in the namespace

595 (see POLYX / Polymesh in https://github.com/satoshilabs/slips/blob/master/slip-0044.md)

References
To ensure timely processing of your request, please provide the following references:

• Source of RPC endpoints (e.g. RPC docs):

https://developers.polymesh.network/
https://github.com/PolymeshAssociation/polymesh
https://mainnet-app.polymesh.network/
https://testnet-app.polymesh.live/

• Source of namespace (if non-EIP155) chain information (particularly chainIds):

https://github.com/ChainAgnostic/CAIPs/blob/main/CAIPs/caip-13.md

Additional context

Polymesh is built on the Substrate framework, making it compatible with the existing Polkadot specified approach of integrating WalletConnect. We have tested this as a PoC with NovaWallet successfully and are looking to have Polymesh added to WalletConnect Chain Explorer for more visibility for dApp developers to integrate WalletConnect when working with Polymesh.

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Please note:

Registering a chain with the Explorer does not impact or improve the ability for wallets and dapps to support your chain. It is simply a way for users to discover wallets and dapps that support your chain by:

• Browsing the Chains List
• Filtering results programmatically via the Explorer API

It is still up to wallets and dapps to provide concrete support for your chain once it is listed as part of the Explorer.

• [ x] I have read and understood the above clarification

[linear]

CR-28 Add Polymesh as a supported chain