Reduce bundle size by replacing ethers with its subpackages

[nedsalk]

Apparently our move to ethers v6 caused our minified+gzipped bundle size to increase by ~200kb (size of fuels@0.62.0, size of fuels@0.63.0).
I took a look around and it seems like we can replace our ethers dependencies with just @ethersproject/bytes.

Edit: ethers v6 supports tree-shaking, so such a big jump in package size shouldn't happen.

[nedsalk]

I built demo-react-vite with the current master and got its size. Afterwards, I removed ethers from all packages and excluded it from the build process in order to not have any build errors, and rebuilt the demo-react-vite app and the size was reduced by only 14 KB, meaning that ethers indeed does get tree-shaken. It seems that bundlephobia.com doesn't catch this part.