ethers: Webpack bundle and browser-html example

[blukat29]

• Additional ethers extension types
  • Web3Provider extends ethers.Web3Provider
  • JsonRpcSigner implements ethers.JsonRpcSigner
• Kaikas wallet support

   const provider = new Web3Provider(window.klaytn);
   const signer = provider.getSigner();
   const address = await signer.getAddress();
   const txhash = await signer.sendTransaction({ type: 8, from: address, to: address, value: 0 });

• Internal refactoring

[blukat29]

@nohkwak @kjeom PR ready.

[kjeom]

@blukat29 @nohkwak It looks like having the type transform layer. It doesn't need to develop the feature in the Kaikas?

[blukat29]

@kjeom It would be great if Kaikas accepted numeric types (8) but currently, Kaikas only accepts string upper snake case (VALUE_TRANSFER) types.

But apart from Kaikas accepting numeric types, ethers-ext will use the string types for maximum compatibility. I believe Kaikas will continue accepting the string types, for both dApp & SDK (i.e. caver) backward compatibility.