feat: added support for the IPFS hash type

[0xf333]

@xermicus

this is to address issue #379

implementation test

cargo test -p resolc ipfs

cargo test -p revive-solc-json-interface ipfs

[xermicus]

Hi, many thanks for the PR!

The end goal (to make this useful first hand) is to append it as CBOR data to the bytecode.

See also the solc documentation:
https://docs.soliditylang.org/en/latest/metadata.html#encoding-of-the-metadata-hash-in-the-bytecode
https://docs.soliditylang.org/en/latest/060-breaking-changes.html#metadata-hash-options

Sorry it doesn't say it in the issue. I added a few sentences to the issue.

[xermicus]

@0xf333 After some more consideration, we might actually store the metadata hash not in the bytecode but in pallet revive. This will simplify the PR here a lot (the PR would be a lot closer to be ready). Please hold your horses. I'll let you know once a decision is made.

[0xf333]

@0xf333 After some more consideration, we might actually store the metadata hash not in the bytecode but in pallet revive. This will simplify the PR here a lot (the PR would be a lot closer to be ready). Please hold your horses. I'll let you know once a decision is made.

@xermicus
Alright, keep me posted. I should have time to jump back to this by next week. Been busy with some infra stuff, sorry for the late reply.
Let's just make sure that it's next week, not the week after that. Let me know, the ball is in your court