index: add support abi encode/decode

[evaporei]

Related issue: graphprotocol/graph-node#2348
Related pull request: graphprotocol/graph-node#2348

I think this Pull Request should have tests as well, how should I proceed with it?

[leoyvens]

These should go in the ethereum namespace, in chains/ethereum.ts

[evaporei]

@leoyvens , should it the two functions be exported directly on ethereum namespace, or should I keep the abi namespace inside of it?

ethereum.{decode, encode} vs ethereum.abi.{decode, encode}

[leoyvens]

@otaviopace they can be directly in the namespace, no need to nest it.

[evaporei]

@leoyvens this and graph-node are finished, I'm looking to see how I can contribute to the docs

[leoyvens]

@otaviopace looks like you accidentally committed the lock file

[evaporei]

@leoyvens I've removed the lock file, sorry!

[leoyvens]

You can merge and have the graph-node PR point to graph-ts master